diff --git a/.github/patch-types.php b/.github/patch-types.php
index b4878156fea42..9d26fa8e3e999 100644
--- a/.github/patch-types.php
+++ b/.github/patch-types.php
@@ -13,30 +13,30 @@
 
 foreach ($loader->getClassMap() as $class => $file) {
     switch (true) {
-        case false !== strpos($file = realpath($file), '/vendor/'):
-        case false !== strpos($file, '/src/Symfony/Bridge/PhpUnit/'):
-        case false !== strpos($file, '/src/Symfony/Bundle/FrameworkBundle/Tests/Fixtures/Validation/Article.php'):
-        case false !== strpos($file, '/src/Symfony/Component/Cache/Tests/Fixtures/DriverWrapper.php'):
-        case false !== strpos($file, '/src/Symfony/Component/Config/Tests/Fixtures/BadFileName.php'):
-        case false !== strpos($file, '/src/Symfony/Component/Config/Tests/Fixtures/BadParent.php'):
-        case false !== strpos($file, '/src/Symfony/Component/Config/Tests/Fixtures/ParseError.php'):
-        case false !== strpos($file, '/src/Symfony/Component/DependencyInjection/Tests/Compiler/OptionalServiceClass.php'):
-        case false !== strpos($file, '/src/Symfony/Component/DependencyInjection/Tests/Fixtures/includes/autowiring_classes.php'):
-        case false !== strpos($file, '/src/Symfony/Component/DependencyInjection/Tests/Fixtures/includes/intersectiontype_classes.php'):
-        case false !== strpos($file, '/src/Symfony/Component/DependencyInjection/Tests/Fixtures/includes/MultipleArgumentsOptionalScalarNotReallyOptional.php'):
-        case false !== strpos($file, '/src/Symfony/Component/DependencyInjection/Tests/Fixtures/CheckTypeDeclarationsPass/IntersectionConstructor.php'):
-        case false !== strpos($file, '/src/Symfony/Component/DependencyInjection/Tests/Fixtures/ParentNotExists.php'):
-        case false !== strpos($file, '/src/Symfony/Component/DependencyInjection/Tests/Fixtures/Preload/'):
-        case false !== strpos($file, '/src/Symfony/Component/DependencyInjection/Tests/Fixtures/Prototype/BadClasses/MissingParent.php'):
-        case false !== strpos($file, '/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/'):
-        case false !== strpos($file, '/src/Symfony/Component/ErrorHandler/Tests/Fixtures/'):
-        case false !== strpos($file, '/src/Symfony/Component/PropertyInfo/Tests/Fixtures/Dummy.php'):
-        case false !== strpos($file, '/src/Symfony/Component/PropertyInfo/Tests/Fixtures/ParentDummy.php'):
-        case false !== strpos($file, '/src/Symfony/Component/PropertyInfo/Tests/Fixtures/TraitUsage/DummyUsingTrait.php'):
-        case false !== strpos($file, '/src/Symfony/Component/Runtime/Internal/ComposerPlugin.php'):
-        case false !== strpos($file, '/src/Symfony/Component/Serializer/Tests/Normalizer/Features/ObjectOuter.php'):
-        case false !== strpos($file, '/src/Symfony/Component/VarDumper/Tests/Fixtures/NotLoadableClass.php'):
-        case false !== strpos($file, '/src/Symfony/Component/VarDumper/Tests/Fixtures/ReflectionIntersectionTypeFixture.php'):
+        case str_contains($file = realpath($file), '/vendor/'):
+        case str_contains($file, '/src/Symfony/Bridge/PhpUnit/'):
+        case str_contains($file, '/src/Symfony/Bundle/FrameworkBundle/Tests/Fixtures/Validation/Article.php'):
+        case str_contains($file, '/src/Symfony/Component/Cache/Tests/Fixtures/DriverWrapper.php'):
+        case str_contains($file, '/src/Symfony/Component/Config/Tests/Fixtures/BadFileName.php'):
+        case str_contains($file, '/src/Symfony/Component/Config/Tests/Fixtures/BadParent.php'):
+        case str_contains($file, '/src/Symfony/Component/Config/Tests/Fixtures/ParseError.php'):
+        case str_contains($file, '/src/Symfony/Component/DependencyInjection/Tests/Compiler/OptionalServiceClass.php'):
+        case str_contains($file, '/src/Symfony/Component/DependencyInjection/Tests/Fixtures/includes/autowiring_classes.php'):
+        case str_contains($file, '/src/Symfony/Component/DependencyInjection/Tests/Fixtures/includes/intersectiontype_classes.php'):
+        case str_contains($file, '/src/Symfony/Component/DependencyInjection/Tests/Fixtures/includes/MultipleArgumentsOptionalScalarNotReallyOptional.php'):
+        case str_contains($file, '/src/Symfony/Component/DependencyInjection/Tests/Fixtures/CheckTypeDeclarationsPass/IntersectionConstructor.php'):
+        case str_contains($file, '/src/Symfony/Component/DependencyInjection/Tests/Fixtures/ParentNotExists.php'):
+        case str_contains($file, '/src/Symfony/Component/DependencyInjection/Tests/Fixtures/Preload/'):
+        case str_contains($file, '/src/Symfony/Component/DependencyInjection/Tests/Fixtures/Prototype/BadClasses/MissingParent.php'):
+        case str_contains($file, '/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/'):
+        case str_contains($file, '/src/Symfony/Component/ErrorHandler/Tests/Fixtures/'):
+        case str_contains($file, '/src/Symfony/Component/PropertyInfo/Tests/Fixtures/Dummy.php'):
+        case str_contains($file, '/src/Symfony/Component/PropertyInfo/Tests/Fixtures/ParentDummy.php'):
+        case str_contains($file, '/src/Symfony/Component/PropertyInfo/Tests/Fixtures/TraitUsage/DummyUsingTrait.php'):
+        case str_contains($file, '/src/Symfony/Component/Runtime/Internal/ComposerPlugin.php'):
+        case str_contains($file, '/src/Symfony/Component/Serializer/Tests/Normalizer/Features/ObjectOuter.php'):
+        case str_contains($file, '/src/Symfony/Component/VarDumper/Tests/Fixtures/NotLoadableClass.php'):
+        case str_contains($file, '/src/Symfony/Component/VarDumper/Tests/Fixtures/ReflectionIntersectionTypeFixture.php'):
             continue 2;
     }
 
diff --git a/src/Symfony/Bridge/Doctrine/DependencyInjection/AbstractDoctrineExtension.php b/src/Symfony/Bridge/Doctrine/DependencyInjection/AbstractDoctrineExtension.php
index 34aba14e9f6ee..868042bc31e6f 100644
--- a/src/Symfony/Bridge/Doctrine/DependencyInjection/AbstractDoctrineExtension.php
+++ b/src/Symfony/Bridge/Doctrine/DependencyInjection/AbstractDoctrineExtension.php
@@ -221,7 +221,7 @@ protected function registerMappingDrivers(array $objectManager, ContainerBuilder
                 ]);
             }
             $mappingDriverDef->setPublic(false);
-            if (false !== strpos($mappingDriverDef->getClass(), 'yml') || false !== strpos($mappingDriverDef->getClass(), 'xml')) {
+            if (str_contains($mappingDriverDef->getClass(), 'yml') || str_contains($mappingDriverDef->getClass(), 'xml')) {
                 $mappingDriverDef->setArguments([array_flip($driverPaths)]);
                 $mappingDriverDef->addMethodCall('setGlobalBasename', ['mapping']);
             }
diff --git a/src/Symfony/Bridge/Doctrine/Security/User/EntityUserProvider.php b/src/Symfony/Bridge/Doctrine/Security/User/EntityUserProvider.php
index 4b5d795cbb0f7..72f0489c85008 100644
--- a/src/Symfony/Bridge/Doctrine/Security/User/EntityUserProvider.php
+++ b/src/Symfony/Bridge/Doctrine/Security/User/EntityUserProvider.php
@@ -161,7 +161,7 @@ private function getClass(): string
         if (null === $this->class) {
             $class = $this->classOrAlias;
 
-            if (false !== strpos($class, ':')) {
+            if (str_contains($class, ':')) {
                 $class = $this->getClassMetadata()->getName();
             }
 
diff --git a/src/Symfony/Bridge/PhpUnit/DeprecationErrorHandler/Deprecation.php b/src/Symfony/Bridge/PhpUnit/DeprecationErrorHandler/Deprecation.php
index f9bd78619d6b5..74536e81793b6 100644
--- a/src/Symfony/Bridge/PhpUnit/DeprecationErrorHandler/Deprecation.php
+++ b/src/Symfony/Bridge/PhpUnit/DeprecationErrorHandler/Deprecation.php
@@ -122,7 +122,7 @@ public function __construct($message, array $trace, $file)
             return;
         }
 
-        if (!isset($line['class'], $trace[$i - 2]['function']) || 0 !== strpos($line['class'], SymfonyTestsListenerFor::class)) {
+        if (!isset($line['class'], $trace[$i - 2]['function']) || str_contains($line['class'], SymfonyTestsListenerFor::class)) {
             $this->originClass = isset($line['object']) ? \get_class($line['object']) : $line['class'];
             $this->originMethod = $line['function'];
 
@@ -171,7 +171,7 @@ public function originatingClass()
 
         $class = $this->originClass;
 
-        return false !== strpos($class, "@anonymous\0") ? (get_parent_class($class) ?: key(class_implements($class)) ?: 'class').'@anonymous' : $class;
+        return str_contains($class, "@anonymous\0") ? (get_parent_class($class) ?: key(class_implements($class)) ?: 'class').'@anonymous' : $class;
     }
 
     /**
@@ -225,7 +225,7 @@ public function isMuted()
             return 0 === strpos($this->trace[1]['class'], 'PHPUnit\\');
         }
 
-        return false !== strpos($this->triggeringFile, \DIRECTORY_SEPARATOR.'vendor'.\DIRECTORY_SEPARATOR.'phpunit'.\DIRECTORY_SEPARATOR);
+        return str_contains($this->triggeringFile, \DIRECTORY_SEPARATOR.'vendor'.\DIRECTORY_SEPARATOR.'phpunit'.\DIRECTORY_SEPARATOR);
     }
 
     /**
@@ -339,7 +339,7 @@ private static function getVendors()
             }
             foreach ($paths as $path) {
                 foreach (self::$vendors as $vendor) {
-                    if (0 !== strpos($path, $vendor)) {
+                    if (str_contains($path, $vendor)) {
                         self::$internalPaths[] = $path;
                     }
                 }
diff --git a/src/Symfony/Bridge/PhpUnit/Tests/DeprecationErrorHandler/fake_vendor/composer/autoload_real.php b/src/Symfony/Bridge/PhpUnit/Tests/DeprecationErrorHandler/fake_vendor/composer/autoload_real.php
index 4b80d96c9bc5d..a9e9a84e616ab 100644
--- a/src/Symfony/Bridge/PhpUnit/Tests/DeprecationErrorHandler/fake_vendor/composer/autoload_real.php
+++ b/src/Symfony/Bridge/PhpUnit/Tests/DeprecationErrorHandler/fake_vendor/composer/autoload_real.php
@@ -27,7 +27,7 @@ public function loadClass($className)
     public function findFile($class)
     {
         foreach ($this->getPrefixesPsr4() as $prefix => $baseDirs) {
-            if (0 !== strpos($class, $prefix)) {
+            if (str_contains($class, $prefix)) {
                 continue;
             }
 
diff --git a/src/Symfony/Bridge/PhpUnit/Tests/DeprecationErrorHandler/fake_vendor_bis/composer/autoload_real.php b/src/Symfony/Bridge/PhpUnit/Tests/DeprecationErrorHandler/fake_vendor_bis/composer/autoload_real.php
index aabb103e4d04c..d140c99b7c1b6 100644
--- a/src/Symfony/Bridge/PhpUnit/Tests/DeprecationErrorHandler/fake_vendor_bis/composer/autoload_real.php
+++ b/src/Symfony/Bridge/PhpUnit/Tests/DeprecationErrorHandler/fake_vendor_bis/composer/autoload_real.php
@@ -17,7 +17,7 @@ public function getPrefixesPsr4()
     public function loadClass($className)
     {
         foreach ($this->getPrefixesPsr4() as $prefix => $baseDirs) {
-            if (0 !== strpos($className, $prefix)) {
+            if (str_contains($className, $prefix)) {
                 continue;
             }
 
diff --git a/src/Symfony/Bridge/Twig/Command/DebugCommand.php b/src/Symfony/Bridge/Twig/Command/DebugCommand.php
index 40ae2d073a20c..bab168716d845 100644
--- a/src/Symfony/Bridge/Twig/Command/DebugCommand.php
+++ b/src/Symfony/Bridge/Twig/Command/DebugCommand.php
@@ -212,7 +212,7 @@ private function displayGeneralText(SymfonyStyle $io, string $filter = null)
         foreach ($types as $index => $type) {
             $items = [];
             foreach ($this->twig->{'get'.ucfirst($type)}() as $name => $entity) {
-                if (!$filter || false !== strpos($name, $filter)) {
+                if (!$filter || str_contains($name, $filter)) {
                     $items[$name] = $name.$this->getPrettyMetadata($type, $entity, $decorated);
                 }
             }
@@ -246,7 +246,7 @@ private function displayGeneralJson(SymfonyStyle $io, ?string $filter)
         $data = [];
         foreach ($types as $type) {
             foreach ($this->twig->{'get'.ucfirst($type)}() as $name => $entity) {
-                if (!$filter || false !== strpos($name, $filter)) {
+                if (!$filter || str_contains($name, $filter)) {
                     $data[$type][$name] = $this->getMetadata($type, $entity);
                 }
             }
@@ -526,7 +526,7 @@ private function findAlternatives(string $name, array $collection): array
         $alternatives = [];
         foreach ($collection as $item) {
             $lev = levenshtein($name, $item);
-            if ($lev <= \strlen($name) / 3 || false !== strpos($item, $name)) {
+            if ($lev <= \strlen($name) / 3 || str_contains($item, $name)) {
                 $alternatives[$item] = isset($alternatives[$item]) ? $alternatives[$item] - $lev : $lev;
             }
         }
diff --git a/src/Symfony/Bridge/Twig/Extension/CodeExtension.php b/src/Symfony/Bridge/Twig/Extension/CodeExtension.php
index b57bb3de3871a..fff853a51f5ed 100644
--- a/src/Symfony/Bridge/Twig/Extension/CodeExtension.php
+++ b/src/Symfony/Bridge/Twig/Extension/CodeExtension.php
@@ -62,7 +62,7 @@ public function abbrClass(string $class): string
 
     public function abbrMethod(string $method): string
     {
-        if (false !== strpos($method, '::')) {
+        if (str_contains($method, '::')) {
             [$class, $method] = explode('::', $method, 2);
             $result = sprintf('%s::%s()', $this->abbrClass($class), $method);
         } elseif ('Closure' === $method) {
@@ -206,7 +206,7 @@ public function formatFileFromText(string $text): string
      */
     public function formatLogMessage(string $message, array $context): string
     {
-        if ($context && false !== strpos($message, '{')) {
+        if ($context && str_contains($message, '{')) {
             $replacements = [];
             foreach ($context as $key => $val) {
                 if (is_scalar($val)) {
diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/ContainerDebugCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/ContainerDebugCommand.php
index 660bf3f96a65a..9181d6803572f 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Command/ContainerDebugCommand.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/ContainerDebugCommand.php
@@ -264,7 +264,7 @@ public function filterToServiceTypes(string $serviceId): bool
         }
 
         // if the id has a \, assume it is a class
-        if (false !== strpos($serviceId, '\\')) {
+        if (str_contains($serviceId, '\\')) {
             return true;
         }
 
diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/DebugAutowiringCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/DebugAutowiringCommand.php
index a3c523ef5ef88..c45bc411dd069 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Command/DebugAutowiringCommand.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/DebugAutowiringCommand.php
@@ -83,7 +83,7 @@ protected function execute(InputInterface $input, OutputInterface $output): int
         if ($search = $input->getArgument('search')) {
             $searchNormalized = preg_replace('/[^a-zA-Z0-9\x7f-\xff]++/', '', $search);
             $serviceIds = array_filter($serviceIds, function ($serviceId) use ($searchNormalized) {
-                return false !== stripos(str_replace('\\', '', $serviceId), $searchNormalized) && 0 !== strpos($serviceId, '.');
+                return false !== stripos(str_replace('\\', '', $serviceId), $searchNormalized) && str_contains($serviceId, '.');
             });
 
             if (empty($serviceIds)) {
@@ -107,7 +107,7 @@ protected function execute(InputInterface $input, OutputInterface $output): int
         foreach ($serviceIds as $serviceId) {
             $text = [];
             $resolvedServiceId = $serviceId;
-            if (0 !== strpos($serviceId, $previousId)) {
+            if (str_contains($serviceId, $previousId)) {
                 $text[] = '';
                 if ('' !== $description = Descriptor::getClassDescription($serviceId, $resolvedServiceId)) {
                     if (isset($hasAlias[$serviceId])) {
diff --git a/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/JsonDescriptor.php b/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/JsonDescriptor.php
index e1067f1fdab8b..6d937bf9c4e65 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/JsonDescriptor.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/JsonDescriptor.php
@@ -313,7 +313,7 @@ private function getCallableData(mixed $callable): array
                 $data['name'] = $callable[1];
                 $data['class'] = \get_class($callable[0]);
             } else {
-                if (0 !== strpos($callable[1], 'parent::')) {
+                if (str_contains($callable[1], 'parent::')) {
                     $data['name'] = $callable[1];
                     $data['class'] = $callable[0];
                     $data['static'] = true;
@@ -348,7 +348,7 @@ private function getCallableData(mixed $callable): array
             $data['type'] = 'closure';
 
             $r = new \ReflectionFunction($callable);
-            if (false !== strpos($r->name, '{closure}')) {
+            if (str_contains($r->name, '{closure}')) {
                 return $data;
             }
             $data['name'] = $r->name;
diff --git a/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/MarkdownDescriptor.php b/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/MarkdownDescriptor.php
index 84d420f47a9ca..9db42d7cc8ba2 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/MarkdownDescriptor.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/MarkdownDescriptor.php
@@ -337,7 +337,7 @@ protected function describeCallable(mixed $callable, array $options = [])
                 $string .= "\n".sprintf('- Name: `%s`', $callable[1]);
                 $string .= "\n".sprintf('- Class: `%s`', \get_class($callable[0]));
             } else {
-                if (0 !== strpos($callable[1], 'parent::')) {
+                if (str_contains($callable[1], 'parent::')) {
                     $string .= "\n".sprintf('- Name: `%s`', $callable[1]);
                     $string .= "\n".sprintf('- Class: `%s`', $callable[0]);
                     $string .= "\n- Static: yes";
@@ -372,7 +372,7 @@ protected function describeCallable(mixed $callable, array $options = [])
             $string .= "\n- Type: `closure`";
 
             $r = new \ReflectionFunction($callable);
-            if (false !== strpos($r->name, '{closure}')) {
+            if (str_contains($r->name, '{closure}')) {
                 return $this->write($string."\n");
             }
             $string .= "\n".sprintf('- Name: `%s`', $r->name);
diff --git a/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/TextDescriptor.php b/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/TextDescriptor.php
index 6a2faa04a3e1e..581395efd0035 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/TextDescriptor.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/TextDescriptor.php
@@ -556,7 +556,7 @@ private function formatControllerLink(mixed $controller, string $anchorText, cal
                 $r = new \ReflectionMethod($controller, '__invoke');
             } elseif (!\is_string($controller)) {
                 return $anchorText;
-            } elseif (false !== strpos($controller, '::')) {
+            } elseif (str_contains($controller, '::')) {
                 $r = new \ReflectionMethod($controller);
             } else {
                 $r = new \ReflectionFunction($controller);
@@ -609,7 +609,7 @@ private function formatCallable(mixed $callable): string
 
         if ($callable instanceof \Closure) {
             $r = new \ReflectionFunction($callable);
-            if (false !== strpos($r->name, '{closure}')) {
+            if (str_contains($r->name, '{closure}')) {
                 return 'Closure()';
             }
             if ($class = $r->getClosureScopeClass()) {
diff --git a/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/XmlDescriptor.php b/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/XmlDescriptor.php
index 86ff4985b6cf3..5de3e67a99068 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/XmlDescriptor.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/XmlDescriptor.php
@@ -505,7 +505,7 @@ private function getCallableDocument(mixed $callable): \DOMDocument
                 $callableXML->setAttribute('name', $callable[1]);
                 $callableXML->setAttribute('class', \get_class($callable[0]));
             } else {
-                if (0 !== strpos($callable[1], 'parent::')) {
+                if (str_contains($callable[1], 'parent::')) {
                     $callableXML->setAttribute('name', $callable[1]);
                     $callableXML->setAttribute('class', $callable[0]);
                     $callableXML->setAttribute('static', 'true');
@@ -540,7 +540,7 @@ private function getCallableDocument(mixed $callable): \DOMDocument
             $callableXML->setAttribute('type', 'closure');
 
             $r = new \ReflectionFunction($callable);
-            if (false !== strpos($r->name, '{closure}')) {
+            if (str_contains($r->name, '{closure}')) {
                 return $dom;
             }
             $callableXML->setAttribute('name', $r->name);
diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/UnusedTagsPass.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/UnusedTagsPass.php
index b164bfc96ad99..392a95ce64b5f 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/UnusedTagsPass.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/UnusedTagsPass.php
@@ -111,7 +111,7 @@ public function process(ContainerBuilder $container)
                     continue;
                 }
 
-                if (false !== strpos($definedTag, $tag) || levenshtein($tag, $definedTag) <= \strlen($tag) / 3) {
+                if (str_contains($definedTag, $tag) || levenshtein($tag, $definedTag) <= \strlen($tag) / 3) {
                     $candidates[] = $definedTag;
                 }
             }
diff --git a/src/Symfony/Bundle/FrameworkBundle/Kernel/MicroKernelTrait.php b/src/Symfony/Bundle/FrameworkBundle/Kernel/MicroKernelTrait.php
index 3a63471c6f630..272a8bf43739d 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Kernel/MicroKernelTrait.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Kernel/MicroKernelTrait.php
@@ -109,7 +109,7 @@ public function registerContainerConfiguration(LoaderInterface $loader)
                 ],
             ]);
 
-            $kernelClass = false !== strpos(static::class, "@anonymous\0") ? parent::class : static::class;
+            $kernelClass = str_contains(static::class, "@anonymous\0") ? parent::class : static::class;
 
             if (!$container->hasDefinition('kernel')) {
                 $container->register('kernel', $kernelClass)
diff --git a/src/Symfony/Bundle/FrameworkBundle/Routing/DelegatingLoader.php b/src/Symfony/Bundle/FrameworkBundle/Routing/DelegatingLoader.php
index 91adfbf579917..7284d3f1db8c4 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Routing/DelegatingLoader.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Routing/DelegatingLoader.php
@@ -82,7 +82,7 @@ public function load(mixed $resource, string $type = null): mixed
                 continue;
             }
 
-            if (false !== strpos($controller, '::')) {
+            if (str_contains($controller, '::')) {
                 continue;
             }
 
diff --git a/src/Symfony/Bundle/FrameworkBundle/Secrets/DotenvVault.php b/src/Symfony/Bundle/FrameworkBundle/Secrets/DotenvVault.php
index 933091d19ce73..3338b973c1645 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Secrets/DotenvVault.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Secrets/DotenvVault.php
@@ -54,7 +54,7 @@ public function reveal(string $name): ?string
     {
         $this->lastMessage = null;
         $this->validateName($name);
-        $v = \is_string($_SERVER[$name] ?? null) && 0 !== strpos($name, 'HTTP_') ? $_SERVER[$name] : ($_ENV[$name] ?? null);
+        $v = \is_string($_SERVER[$name] ?? null) && str_contains($name, 'HTTP_') ? $_SERVER[$name] : ($_ENV[$name] ?? null);
 
         if (null === $v) {
             $this->lastMessage = sprintf('Secret "%s" not found in "%s".', $name, $this->getPrettyPath($this->dotenvFile));
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/CachePoolsTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/CachePoolsTest.php
index 0e67c73ed8cc0..edd12b4487d32 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/CachePoolsTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/CachePoolsTest.php
@@ -35,12 +35,12 @@ public function testRedisCachePools()
         try {
             $this->doTestCachePools(['root_config' => 'redis_config.yml', 'environment' => 'redis_cache'], RedisAdapter::class);
         } catch (\PHPUnit\Framework\Error\Warning $e) {
-            if (0 !== strpos($e->getMessage(), 'unable to connect to')) {
+            if (str_contains($e->getMessage(), 'unable to connect to')) {
                 throw $e;
             }
             $this->markTestSkipped($e->getMessage());
         } catch (InvalidArgumentException $e) {
-            if (0 !== strpos($e->getMessage(), 'Redis connection ')) {
+            if (str_contains($e->getMessage(), 'Redis connection ')) {
                 throw $e;
             }
             $this->markTestSkipped($e->getMessage());
@@ -58,7 +58,7 @@ public function testRedisCustomCachePools()
         try {
             $this->doTestCachePools(['root_config' => 'redis_custom_config.yml', 'environment' => 'custom_redis_cache'], RedisAdapter::class);
         } catch (\PHPUnit\Framework\Error\Warning $e) {
-            if (0 !== strpos($e->getMessage(), 'unable to connect to')) {
+            if (str_contains($e->getMessage(), 'unable to connect to')) {
                 throw $e;
             }
             $this->markTestSkipped($e->getMessage());
diff --git a/src/Symfony/Bundle/SecurityBundle/Command/DebugFirewallCommand.php b/src/Symfony/Bundle/SecurityBundle/Command/DebugFirewallCommand.php
index c16818cdb388a..33011662d2a6b 100644
--- a/src/Symfony/Bundle/SecurityBundle/Command/DebugFirewallCommand.php
+++ b/src/Symfony/Bundle/SecurityBundle/Command/DebugFirewallCommand.php
@@ -246,7 +246,7 @@ private function formatCallable(mixed $callable): string
 
         if ($callable instanceof \Closure) {
             $r = new \ReflectionFunction($callable);
-            if (false !== strpos($r->name, '{closure}')) {
+            if (str_contains($r->name, '{closure}')) {
                 return 'Closure()';
             }
             if ($class = $r->getClosureScopeClass()) {
diff --git a/src/Symfony/Bundle/SecurityBundle/DependencyInjection/MainConfiguration.php b/src/Symfony/Bundle/SecurityBundle/DependencyInjection/MainConfiguration.php
index a5dc679cda3f3..78f36cd16e878 100644
--- a/src/Symfony/Bundle/SecurityBundle/DependencyInjection/MainConfiguration.php
+++ b/src/Symfony/Bundle/SecurityBundle/DependencyInjection/MainConfiguration.php
@@ -307,7 +307,7 @@ private function addFirewallsSection(ArrayNodeDefinition $rootNode, array $facto
                             continue;
                         }
 
-                        if (false !== strpos($firewall[$k]['check_path'], '/') && !preg_match('#'.$firewall['pattern'].'#', $firewall[$k]['check_path'])) {
+                        if (str_contains($firewall[$k]['check_path'], '/') && !preg_match('#'.$firewall['pattern'].'#', $firewall[$k]['check_path'])) {
                             throw new \LogicException(sprintf('The check_path "%s" for login method "%s" is not matched by the firewall pattern "%s".', $firewall[$k]['check_path'], $k, $firewall['pattern']));
                         }
                     }
diff --git a/src/Symfony/Component/Asset/Package.php b/src/Symfony/Component/Asset/Package.php
index 0d39958825f50..21148c2f25247 100644
--- a/src/Symfony/Component/Asset/Package.php
+++ b/src/Symfony/Component/Asset/Package.php
@@ -73,6 +73,6 @@ protected function getVersionStrategy()
      */
     protected function isAbsoluteUrl(string $url)
     {
-        return false !== strpos($url, '://') || '//' === substr($url, 0, 2);
+        return str_contains($url, '://') || '//' === substr($url, 0, 2);
     }
 }
diff --git a/src/Symfony/Component/BrowserKit/CookieJar.php b/src/Symfony/Component/BrowserKit/CookieJar.php
index 3a585bed668f3..fba06ad9f9a82 100644
--- a/src/Symfony/Component/BrowserKit/CookieJar.php
+++ b/src/Symfony/Component/BrowserKit/CookieJar.php
@@ -48,7 +48,7 @@ public function get(string $name, string $path = '/', string $domain = null)
             }
 
             foreach ($pathCookies as $cookiePath => $namedCookies) {
-                if (0 !== strpos($path, $cookiePath)) {
+                if (str_contains($path, $cookiePath)) {
                     continue;
                 }
                 if (isset($namedCookies[$name])) {
diff --git a/src/Symfony/Component/Cache/Adapter/CouchbaseBucketAdapter.php b/src/Symfony/Component/Cache/Adapter/CouchbaseBucketAdapter.php
index 5cd25f422e541..217d2880d8a1e 100644
--- a/src/Symfony/Component/Cache/Adapter/CouchbaseBucketAdapter.php
+++ b/src/Symfony/Component/Cache/Adapter/CouchbaseBucketAdapter.php
@@ -79,7 +79,7 @@ public static function createConnection(array|string $servers, array $options =
             $password = $options['password'];
 
             foreach ($servers as $dsn) {
-                if (0 !== strpos($dsn, 'couchbase:')) {
+                if (str_contains($dsn, 'couchbase:')) {
                     throw new InvalidArgumentException(sprintf('Invalid Couchbase DSN: "%s" does not start with "couchbase:".', $dsn));
                 }
 
diff --git a/src/Symfony/Component/Cache/Adapter/MemcachedAdapter.php b/src/Symfony/Component/Cache/Adapter/MemcachedAdapter.php
index 0590af3c00461..3891b4b2fc55c 100644
--- a/src/Symfony/Component/Cache/Adapter/MemcachedAdapter.php
+++ b/src/Symfony/Component/Cache/Adapter/MemcachedAdapter.php
@@ -118,7 +118,7 @@ public static function createConnection(array|string $servers, array $options =
                 if (\is_array($dsn)) {
                     continue;
                 }
-                if (0 !== strpos($dsn, 'memcached:')) {
+                if (str_contains($dsn, 'memcached:')) {
                     throw new InvalidArgumentException(sprintf('Invalid Memcached DSN: "%s" does not start with "memcached:".', $dsn));
                 }
                 $params = preg_replace_callback('#^memcached:(//)?(?:([^@]*+)@)?#', function ($m) use (&$username, &$password) {
diff --git a/src/Symfony/Component/Cache/Adapter/RedisTagAwareAdapter.php b/src/Symfony/Component/Cache/Adapter/RedisTagAwareAdapter.php
index fe2ed34cbfa56..bae625130c285 100644
--- a/src/Symfony/Component/Cache/Adapter/RedisTagAwareAdapter.php
+++ b/src/Symfony/Component/Cache/Adapter/RedisTagAwareAdapter.php
@@ -83,7 +83,7 @@ public function __construct(\Redis|\RedisArray|\RedisCluster|\Predis\ClientInter
     protected function doSave(array $values, int $lifetime, array $addTagData = [], array $delTagData = []): array
     {
         $eviction = $this->getRedisEvictionPolicy();
-        if ('noeviction' !== $eviction && 0 !== strpos($eviction, 'volatile-')) {
+        if ('noeviction' !== $eviction && str_contains($eviction, 'volatile-')) {
             throw new LogicException(sprintf('Redis maxmemory-policy setting "%s" is *not* supported by RedisTagAwareAdapter, use "noeviction" or "volatile-*" eviction policies.', $eviction));
         }
 
diff --git a/src/Symfony/Component/Cache/Traits/FilesystemCommonTrait.php b/src/Symfony/Component/Cache/Traits/FilesystemCommonTrait.php
index 07d72313809d9..01a5332fb505c 100644
--- a/src/Symfony/Component/Cache/Traits/FilesystemCommonTrait.php
+++ b/src/Symfony/Component/Cache/Traits/FilesystemCommonTrait.php
@@ -58,7 +58,7 @@ protected function doClear(string $namespace)
         $ok = true;
 
         foreach ($this->scanHashDir($this->directory) as $file) {
-            if ('' !== $namespace && 0 !== strpos($this->getFileKey($file), $namespace)) {
+            if ('' !== $namespace && str_contains($this->getFileKey($file), $namespace)) {
                 continue;
             }
 
diff --git a/src/Symfony/Component/Config/Definition/ArrayNode.php b/src/Symfony/Component/Config/Definition/ArrayNode.php
index 7f4ffaabbe105..bf3f754f477b9 100644
--- a/src/Symfony/Component/Config/Definition/ArrayNode.php
+++ b/src/Symfony/Component/Config/Definition/ArrayNode.php
@@ -55,7 +55,7 @@ protected function preNormalize(mixed $value)
         $normalized = [];
 
         foreach ($value as $k => $v) {
-            if (false !== strpos($k, '-') && false === strpos($k, '_') && !\array_key_exists($normalizedKey = str_replace('-', '_', $k), $value)) {
+            if (str_contains($k, '-') && false === strpos($k, '_') && !\array_key_exists($normalizedKey = str_replace('-', '_', $k), $value)) {
                 $normalized[$normalizedKey] = $v;
             } else {
                 $normalized[$k] = $v;
diff --git a/src/Symfony/Component/Config/Definition/BaseNode.php b/src/Symfony/Component/Config/Definition/BaseNode.php
index f3ded874456de..e82e564f7b668 100644
--- a/src/Symfony/Component/Config/Definition/BaseNode.php
+++ b/src/Symfony/Component/Config/Definition/BaseNode.php
@@ -47,7 +47,7 @@ abstract class BaseNode implements NodeInterface
      */
     public function __construct(?string $name, NodeInterface $parent = null, string $pathSeparator = self::DEFAULT_PATH_SEPARATOR)
     {
-        if (false !== strpos($name = (string) $name, $pathSeparator)) {
+        if (str_contains($name = (string) $name, $pathSeparator)) {
             throw new \InvalidArgumentException('The name must not contain ".'.$pathSeparator.'".');
         }
 
diff --git a/src/Symfony/Component/Config/Loader/FileLoader.php b/src/Symfony/Component/Config/Loader/FileLoader.php
index b910027da0680..e09c928e71a1a 100644
--- a/src/Symfony/Component/Config/Loader/FileLoader.php
+++ b/src/Symfony/Component/Config/Loader/FileLoader.php
@@ -82,7 +82,7 @@ public function import(mixed $resource, string $type = null, bool $ignoreErrors
             }
 
             $ret = [];
-            $isSubpath = 0 !== $i && false !== strpos(substr($resource, 0, $i), '/');
+            $isSubpath = 0 !== $i && str_contains(substr($resource, 0, $i), '/');
             foreach ($this->glob($resource, false, $_, $ignoreErrors || !$isSubpath, false, $excluded) as $path => $info) {
                 if (null !== $res = $this->doImport($path, 'glob' === $type ? null : $type, $ignoreErrors, $sourceResource)) {
                     $ret[] = $res;
diff --git a/src/Symfony/Component/Config/Resource/GlobResource.php b/src/Symfony/Component/Config/Resource/GlobResource.php
index 0449bdc2a150d..cab445e39298c 100644
--- a/src/Symfony/Component/Config/Resource/GlobResource.php
+++ b/src/Symfony/Component/Config/Resource/GlobResource.php
@@ -104,7 +104,7 @@ public function getIterator(): \Traversable
         $prefix = str_replace('\\', '/', $this->prefix);
         $paths = null;
 
-        if (0 !== strpos($this->prefix, 'phar://') && false === strpos($this->pattern, '/**/')) {
+        if (str_contains($this->prefix, 'phar://') && false === strpos($this->pattern, '/**/')) {
             if ($this->globBrace || false === strpos($this->pattern, '{')) {
                 $paths = glob($this->prefix.$this->pattern, \GLOB_NOSORT | $this->globBrace);
             } elseif (false === strpos($this->pattern, '\\') || !preg_match('/\\\\[,{}]/', $this->pattern)) {
@@ -220,7 +220,7 @@ private function expandGlob(string $pattern): array
 
         $j = 0;
         foreach ($patterns as $i => $p) {
-            if (false !== strpos($p, '{')) {
+            if (str_contains($p, '{')) {
                 $p = $this->expandGlob($p);
                 array_splice($paths, $i + $j, 1, $p);
                 $j += \count($p) - 1;
diff --git a/src/Symfony/Component/Console/Application.php b/src/Symfony/Component/Console/Application.php
index f76c1f7052580..769c65d63e6bf 100644
--- a/src/Symfony/Component/Console/Application.php
+++ b/src/Symfony/Component/Console/Application.php
@@ -819,7 +819,7 @@ protected function doRenderThrowable(\Throwable $e, OutputInterface $output): vo
                 $len = 0;
             }
 
-            if (false !== strpos($message, "@anonymous\0")) {
+            if (str_contains($message, "@anonymous\0")) {
                 $message = preg_replace_callback('/[a-zA-Z_\x7f-\xff][\\\\a-zA-Z0-9_\x7f-\xff]*+@anonymous\x00.*?\.php(?:0x?|:[0-9]++\$)[0-9a-fA-F]++/', function ($m) {
                     return class_exists($m[0], false) ? (get_parent_class($m[0]) ?: key(class_implements($m[0])) ?: 'class').'@anonymous' : $m[0];
                 }, $message);
@@ -1119,7 +1119,7 @@ private function findAlternatives(string $name, iterable $collection): array
                 }
 
                 $lev = levenshtein($subname, $parts[$i]);
-                if ($lev <= \strlen($subname) / 3 || '' !== $subname && false !== strpos($parts[$i], $subname)) {
+                if ($lev <= \strlen($subname) / 3 || '' !== $subname && str_contains($parts[$i], $subname)) {
                     $alternatives[$collectionName] = $exists ? $alternatives[$collectionName] + $lev : $lev;
                 } elseif ($exists) {
                     $alternatives[$collectionName] += $threshold;
@@ -1129,7 +1129,7 @@ private function findAlternatives(string $name, iterable $collection): array
 
         foreach ($collection as $item) {
             $lev = levenshtein($name, $item);
-            if ($lev <= \strlen($name) / 3 || false !== strpos($item, $name)) {
+            if ($lev <= \strlen($name) / 3 || str_contains($item, $name)) {
                 $alternatives[$item] = isset($alternatives[$item]) ? $alternatives[$item] - $lev : $lev;
             }
         }
diff --git a/src/Symfony/Component/Console/Command/Command.php b/src/Symfony/Component/Console/Command/Command.php
index 8cb4aeb36c8eb..9ddaec8a7864b 100644
--- a/src/Symfony/Component/Console/Command/Command.php
+++ b/src/Symfony/Component/Console/Command/Command.php
@@ -647,7 +647,7 @@ public function getSynopsis(bool $short = false)
      */
     public function addUsage(string $usage)
     {
-        if (0 !== strpos($usage, $this->name)) {
+        if (str_contains($usage, $this->name)) {
             $usage = sprintf('%s %s', $this->name, $usage);
         }
 
diff --git a/src/Symfony/Component/Console/Formatter/OutputFormatter.php b/src/Symfony/Component/Console/Formatter/OutputFormatter.php
index 52ca232730553..7f1d9e13e2a0f 100644
--- a/src/Symfony/Component/Console/Formatter/OutputFormatter.php
+++ b/src/Symfony/Component/Console/Formatter/OutputFormatter.php
@@ -178,7 +178,7 @@ public function formatAndWrap(?string $message, int $width)
 
         $output .= $this->applyCurrentStyle(substr($message, $offset), $output, $width, $currentLineLength);
 
-        if (false !== strpos($output, "\0")) {
+        if (str_contains($output, "\0")) {
             return strtr($output, ["\0" => '\\', '\\<' => '<']);
         }
 
diff --git a/src/Symfony/Component/Console/Input/ArgvInput.php b/src/Symfony/Component/Console/Input/ArgvInput.php
index 771e8daec6ede..c73a43ba76753 100644
--- a/src/Symfony/Component/Console/Input/ArgvInput.php
+++ b/src/Symfony/Component/Console/Input/ArgvInput.php
@@ -133,7 +133,7 @@ private function parseLongOption(string $token)
     {
         $name = substr($token, 2);
 
-        if (false !== $pos = strpos($name, '=')) {
+        if ($pos = str_contains($name, '=')) {
             if (0 === \strlen($value = substr($name, $pos + 1))) {
                 array_unshift($this->parsed, $value);
             }
@@ -264,7 +264,7 @@ public function getFirstArgument()
         $isOption = false;
         foreach ($this->tokens as $i => $token) {
             if ($token && '-' === $token[0]) {
-                if (false !== strpos($token, '=') || !isset($this->tokens[$i + 1])) {
+                if (str_contains($token, '=') || !isset($this->tokens[$i + 1])) {
                     continue;
                 }
 
diff --git a/src/Symfony/Component/CssSelector/XPath/Translator.php b/src/Symfony/Component/CssSelector/XPath/Translator.php
index b0045bd4d4f45..2b87d51796402 100644
--- a/src/Symfony/Component/CssSelector/XPath/Translator.php
+++ b/src/Symfony/Component/CssSelector/XPath/Translator.php
@@ -74,7 +74,7 @@ public static function getXpathLiteral(string $element): string
         $string = $element;
         $parts = [];
         while (true) {
-            if (false !== $pos = strpos($string, "'")) {
+            if ($pos = str_contains($string, "'")) {
                 $parts[] = sprintf("'%s'", substr($string, 0, $pos));
                 $parts[] = "\"'\"";
                 $string = substr($string, $pos + 1);
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/CheckExceptionOnInvalidReferenceBehaviorPass.php b/src/Symfony/Component/DependencyInjection/Compiler/CheckExceptionOnInvalidReferenceBehaviorPass.php
index eb4af610b165c..771df761bd6d8 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/CheckExceptionOnInvalidReferenceBehaviorPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/CheckExceptionOnInvalidReferenceBehaviorPass.php
@@ -95,7 +95,7 @@ private function getAlternatives(string $id): array
             }
 
             $lev = levenshtein($id, $knownId);
-            if ($lev <= \strlen($id) / 3 || false !== strpos($knownId, $id)) {
+            if ($lev <= \strlen($id) / 3 || str_contains($knownId, $id)) {
                 $alternatives[] = $knownId;
             }
         }
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/CheckTypeDeclarationsPass.php b/src/Symfony/Component/DependencyInjection/Compiler/CheckTypeDeclarationsPass.php
index 2be7b71622828..56c498d75daa4 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/CheckTypeDeclarationsPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/CheckTypeDeclarationsPass.php
@@ -231,7 +231,7 @@ private function checkType(Definition $checkedDefinition, mixed $value, \Reflect
                 $value = $this->container->getParameter(substr($value, 1, -1));
             }
 
-            if ($envPlaceholderUniquePrefix && \is_string($value) && false !== strpos($value, 'env_')) {
+            if ($envPlaceholderUniquePrefix && \is_string($value) && str_contains($value, 'env_')) {
                 // If the value is an env placeholder that is either mixed with a string or with another env placeholder, then its resolved value will always be a string, so we don't need to resolve it.
                 // We don't need to change the value because it is already a string.
                 if ('' === preg_replace('/'.$envPlaceholderUniquePrefix.'_\w+_[a-f0-9]{32}/U', '', $value, -1, $c) && 1 === $c) {
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/Compiler.php b/src/Symfony/Component/DependencyInjection/Compiler/Compiler.php
index 36fdb65652e40..a26030e458ef6 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/Compiler.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/Compiler.php
@@ -64,7 +64,7 @@ public function addPass(CompilerPassInterface $pass, string $type = PassConfig::
      */
     public function log(CompilerPassInterface $pass, string $message)
     {
-        if (false !== strpos($message, "\n")) {
+        if (str_contains($message, "\n")) {
             $message = str_replace("\n", "\n".\get_class($pass).': ', trim($message));
         }
 
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/RegisterServiceSubscribersPass.php b/src/Symfony/Component/DependencyInjection/Compiler/RegisterServiceSubscribersPass.php
index b31b471ec1ddd..4db6765530ad4 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/RegisterServiceSubscribersPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/RegisterServiceSubscribersPass.php
@@ -96,9 +96,9 @@ protected function processValue(mixed $value, bool $isRoot = false)
             }
 
             if ($name) {
-                if (false !== $i = strpos($name, '::get')) {
+                if ($i = str_contains($name, '::get')) {
                     $name = lcfirst(substr($name, 5 + $i));
-                } elseif (false !== strpos($name, '::')) {
+                } elseif (str_contains($name, '::')) {
                     $name = null;
                 }
             }
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/ResolveBindingsPass.php b/src/Symfony/Component/DependencyInjection/Compiler/ResolveBindingsPass.php
index c0b236629234f..1fdff3cccc487 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/ResolveBindingsPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/ResolveBindingsPass.php
@@ -45,7 +45,7 @@ public function process(ContainerBuilder $container)
             foreach ($this->unusedBindings as [$key, $serviceId, $bindingType, $file]) {
                 $argumentType = $argumentName = $message = null;
 
-                if (false !== strpos($key, ' ')) {
+                if (str_contains($key, ' ')) {
                     [$argumentType, $argumentName] = explode(' ', $key, 2);
                 } elseif ('$' === $key[0]) {
                     $argumentName = $key;
diff --git a/src/Symfony/Component/DependencyInjection/Container.php b/src/Symfony/Component/DependencyInjection/Container.php
index f9f6a704936ee..90a0eb7fe3577 100644
--- a/src/Symfony/Component/DependencyInjection/Container.php
+++ b/src/Symfony/Component/DependencyInjection/Container.php
@@ -250,7 +250,7 @@ private function make(string $id, int $invalidBehavior)
                     continue;
                 }
                 $lev = levenshtein($id, $knownId);
-                if ($lev <= \strlen($id) / 3 || false !== strpos($knownId, $id)) {
+                if ($lev <= \strlen($id) / 3 || str_contains($knownId, $id)) {
                     $alternatives[] = $knownId;
                 }
             }
@@ -367,7 +367,7 @@ protected function getEnv(string $name)
         $this->getEnv ??= \Closure::fromCallable([$this, 'getEnv']);
         $processors = $this->get($id);
 
-        if (false !== $i = strpos($name, ':')) {
+        if ($i = str_contains($name, ':')) {
             $prefix = substr($name, 0, $i);
             $localName = substr($name, 1 + $i);
         } else {
diff --git a/src/Symfony/Component/DependencyInjection/Definition.php b/src/Symfony/Component/DependencyInjection/Definition.php
index f4300af3fd394..ad30e71f5fe07 100644
--- a/src/Symfony/Component/DependencyInjection/Definition.php
+++ b/src/Symfony/Component/DependencyInjection/Definition.php
@@ -104,7 +104,7 @@ public function setFactory(string|array|Reference|null $factory)
     {
         $this->changes['factory'] = true;
 
-        if (\is_string($factory) && false !== strpos($factory, '::')) {
+        if (\is_string($factory) && str_contains($factory, '::')) {
             $factory = explode('::', $factory, 2);
         } elseif ($factory instanceof Reference) {
             $factory = [$factory, '__invoke'];
@@ -736,7 +736,7 @@ public function setConfigurator(string|array|Reference|null $configurator)
     {
         $this->changes['configurator'] = true;
 
-        if (\is_string($configurator) && false !== strpos($configurator, '::')) {
+        if (\is_string($configurator) && str_contains($configurator, '::')) {
             $configurator = explode('::', $configurator, 2);
         } elseif ($configurator instanceof Reference) {
             $configurator = [$configurator, '__invoke'];
diff --git a/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php b/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
index fe57f2e29c6f6..d2aa2031d63cd 100644
--- a/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
+++ b/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
@@ -155,7 +155,7 @@ public function dump(array $options = [])
         $this->inlineRequires = $options['inline_class_loader_parameter'] && ($this->container->hasParameter($options['inline_class_loader_parameter']) ? $this->container->getParameter($options['inline_class_loader_parameter']) : $options['debug']);
         $this->serviceLocatorTag = $options['service_locator_tag'];
 
-        if (0 !== strpos($baseClass = $options['base_class'], '\\') && 'Container' !== $baseClass) {
+        if (str_contains($baseClass = $options['base_class'], '\\') && 'Container' !== $baseClass) {
             $baseClass = sprintf('%s\%s', $options['namespace'] ? '\\'.$options['namespace'] : '', $baseClass);
             $this->baseClass = $baseClass;
         } elseif ('Container' === $baseClass) {
@@ -327,7 +327,7 @@ class %s extends {$options['class']}
 EOF;
 
                 foreach ($this->preload as $class) {
-                    if (!$class || false !== strpos($class, '$') || \in_array($class, ['int', 'float', 'string', 'bool', 'resource', 'object', 'array', 'null', 'callable', 'iterable', 'mixed', 'void'], true)) {
+                    if (!$class || str_contains($class, '$') || \in_array($class, ['int', 'float', 'string', 'bool', 'resource', 'object', 'array', 'null', 'callable', 'iterable', 'mixed', 'void'], true)) {
                         continue;
                     }
                     if (!(class_exists($class, false) || interface_exists($class, false) || trait_exists($class, false)) || (new \ReflectionClass($class))->isUserDefined()) {
@@ -1864,10 +1864,10 @@ private function dumpValue(mixed $value, bool $interpolate = true): string
      */
     private function dumpLiteralClass(string $class): string
     {
-        if (false !== strpos($class, '$')) {
+        if (str_contains($class, '$')) {
             return sprintf('${($_ = %s) && false ?: "_"}', $class);
         }
-        if (0 !== strpos($class, "'") || !preg_match('/^\'(?:\\\{2})?[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*(?:\\\{2}[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)*\'$/', $class)) {
+        if (str_contains($class, "'") || !preg_match('/^\'(?:\\\{2})?[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*(?:\\\{2}[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)*\'$/', $class)) {
             throw new RuntimeException(sprintf('Cannot dump definition because of invalid class name (%s).', $class ?: 'n/a'));
         }
 
@@ -2113,7 +2113,7 @@ private function doExport(mixed $value, bool $resolveEnv = false): mixed
         if ($shouldCacheValue && isset($this->exportedVariables[$value])) {
             return $this->exportedVariables[$value];
         }
-        if (\is_string($value) && false !== strpos($value, "\n")) {
+        if (\is_string($value) && str_contains($value, "\n")) {
             $cleanParts = explode("\n", $value);
             $cleanParts = array_map(function ($part) { return var_export($part, true); }, $cleanParts);
             $export = implode('."\n".', $cleanParts);
@@ -2121,10 +2121,10 @@ private function doExport(mixed $value, bool $resolveEnv = false): mixed
             $export = var_export($value, true);
         }
         if ($this->asFiles) {
-            if (false !== strpos($export, '$this')) {
+            if (str_contains($export, '$this')) {
                 $export = str_replace('$this', "$'.'this", $export);
             }
-            if (false !== strpos($export, 'function () {')) {
+            if (str_contains($export, 'function () {')) {
                 $export = str_replace('function () {', "function ('.') {", $export);
             }
         }
diff --git a/src/Symfony/Component/DependencyInjection/EnvVarProcessor.php b/src/Symfony/Component/DependencyInjection/EnvVarProcessor.php
index 5e40c6ec6c7ad..39ddc607f60f8 100644
--- a/src/Symfony/Component/DependencyInjection/EnvVarProcessor.php
+++ b/src/Symfony/Component/DependencyInjection/EnvVarProcessor.php
@@ -130,7 +130,7 @@ public function getEnv(string $prefix, string $name, \Closure $getEnv)
             $env = $getEnv($name);
         } elseif (isset($_ENV[$name])) {
             $env = $_ENV[$name];
-        } elseif (isset($_SERVER[$name]) && 0 !== strpos($name, 'HTTP_')) {
+        } elseif (isset($_SERVER[$name]) && str_contains($name, 'HTTP_')) {
             $env = $_SERVER[$name];
         } elseif (false === ($env = getenv($name)) || null === $env) { // null is a possible value because of thread safety issues
             foreach ($this->loadedVars as $vars) {
diff --git a/src/Symfony/Component/DependencyInjection/Extension/Extension.php b/src/Symfony/Component/DependencyInjection/Extension/Extension.php
index 04910dea2eb1f..86898090138f0 100644
--- a/src/Symfony/Component/DependencyInjection/Extension/Extension.php
+++ b/src/Symfony/Component/DependencyInjection/Extension/Extension.php
@@ -82,7 +82,7 @@ public function getConfiguration(array $config, ContainerBuilder $container)
     {
         $class = static::class;
 
-        if (false !== strpos($class, "\0")) {
+        if (str_contains($class, "\0")) {
             return null; // ignore anonymous classes
         }
 
diff --git a/src/Symfony/Component/DependencyInjection/Loader/FileLoader.php b/src/Symfony/Component/DependencyInjection/Loader/FileLoader.php
index b43b3b643cc4c..c2a57b5da355e 100644
--- a/src/Symfony/Component/DependencyInjection/Loader/FileLoader.php
+++ b/src/Symfony/Component/DependencyInjection/Loader/FileLoader.php
@@ -193,7 +193,7 @@ private function findClasses(string $namespace, string $pattern, array $excludeP
             if (null === $prefixLen) {
                 $prefixLen = \strlen($resource->getPrefix());
 
-                if ($excludePrefix && 0 !== strpos($excludePrefix, $resource->getPrefix())) {
+                if ($excludePrefix && str_contains($excludePrefix, $resource->getPrefix())) {
                     throw new InvalidArgumentException(sprintf('Invalid "exclude" pattern when importing classes for "%s": make sure your "exclude" pattern (%s) is a subset of the "resource" pattern (%s).', $namespace, $excludePattern, $pattern));
                 }
             }
diff --git a/src/Symfony/Component/DependencyInjection/Loader/PhpFileLoader.php b/src/Symfony/Component/DependencyInjection/Loader/PhpFileLoader.php
index 72f85fa179222..7bc44acbf1608 100644
--- a/src/Symfony/Component/DependencyInjection/Loader/PhpFileLoader.php
+++ b/src/Symfony/Component/DependencyInjection/Loader/PhpFileLoader.php
@@ -178,7 +178,7 @@ private function configBuilder(string $namespace): ConfigBuilderInterface
         // Try to get the extension alias
         $alias = Container::underscore(substr($namespace, 15, -6));
 
-        if (false !== strpos($alias, '\\')) {
+        if (str_contains($alias, '\\')) {
             throw new InvalidArgumentException('You can only use "root" ConfigBuilders from "Symfony\\Config\\" namespace. Nested classes like "Symfony\\Config\\Framework\\CacheConfig" cannot be used.');
         }
 
diff --git a/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php b/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php
index 4123af7e18ee0..a772703b58db0 100644
--- a/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php
+++ b/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php
@@ -342,7 +342,7 @@ private function parseDefinition(\DOMElement $service, string $file, Definition
                     continue;
                 }
 
-                if (false !== strpos($name, '-') && false === strpos($name, '_') && !\array_key_exists($normalizedName = str_replace('-', '_', $name), $parameters)) {
+                if (str_contains($name, '-') && false === strpos($name, '_') && !\array_key_exists($normalizedName = str_replace('-', '_', $name), $parameters)) {
                     $parameters[$normalizedName] = XmlUtils::phpize($node->nodeValue);
                 }
                 // keep not normalized key
diff --git a/src/Symfony/Component/DependencyInjection/ParameterBag/ParameterBag.php b/src/Symfony/Component/DependencyInjection/ParameterBag/ParameterBag.php
index 6b1e9e4a4818f..7b30ff9156260 100644
--- a/src/Symfony/Component/DependencyInjection/ParameterBag/ParameterBag.php
+++ b/src/Symfony/Component/DependencyInjection/ParameterBag/ParameterBag.php
@@ -69,13 +69,13 @@ public function get(string $name)
             $alternatives = [];
             foreach ($this->parameters as $key => $parameterValue) {
                 $lev = levenshtein($name, $key);
-                if ($lev <= \strlen($name) / 3 || false !== strpos($key, $name)) {
+                if ($lev <= \strlen($name) / 3 || str_contains($key, $name)) {
                     $alternatives[] = $key;
                 }
             }
 
             $nonNestedAlternative = null;
-            if (!\count($alternatives) && false !== strpos($name, '.')) {
+            if (!\count($alternatives) && str_contains($name, '.')) {
                 $namePartsLength = array_map('strlen', explode('.', $name));
                 $key = substr($name, 0, -1 * (1 + array_pop($namePartsLength)));
                 while (\count($namePartsLength)) {
diff --git a/src/Symfony/Component/DomCrawler/Crawler.php b/src/Symfony/Component/DomCrawler/Crawler.php
index fd6ad538ff227..289a28eac59b9 100644
--- a/src/Symfony/Component/DomCrawler/Crawler.php
+++ b/src/Symfony/Component/DomCrawler/Crawler.php
@@ -147,7 +147,7 @@ public function addContent(string $content, string $type = null)
         $charset = null;
         if (false !== $pos = stripos($type, 'charset=')) {
             $charset = substr($type, $pos + 8);
-            if (false !== $pos = strpos($charset, ';')) {
+            if ($pos = str_contains($charset, ';')) {
                 $charset = substr($charset, 0, $pos);
             }
         }
@@ -939,7 +939,7 @@ public static function xpathLiteral(string $s)
         $string = $s;
         $parts = [];
         while (true) {
-            if (false !== $pos = strpos($string, "'")) {
+            if ($pos = str_contains($string, "'")) {
                 $parts[] = sprintf("'%s'", substr($string, 0, $pos));
                 $parts[] = "\"'\"";
                 $string = substr($string, $pos + 1);
@@ -1049,7 +1049,7 @@ private function relativize(string $xpath): string
             } elseif (preg_match('/^(ancestor|ancestor-or-self|attribute|following|following-sibling|namespace|parent|preceding|preceding-sibling)::/', $expression)) {
                 // the fake root has no parent, preceding or following nodes and also no attributes (even no namespace attributes)
                 $expression = $nonMatchingExpression;
-            } elseif (0 !== strpos($expression, 'descendant-or-self::')) {
+            } elseif (str_contains($expression, 'descendant-or-self::')) {
                 $expression = 'self::'.$expression;
             }
             $expressions[] = $parenthesis.$expression;
diff --git a/src/Symfony/Component/DomCrawler/Test/Constraint/CrawlerSelectorTextContains.php b/src/Symfony/Component/DomCrawler/Test/Constraint/CrawlerSelectorTextContains.php
index 17af3aa1fe19b..2697af02500fb 100644
--- a/src/Symfony/Component/DomCrawler/Test/Constraint/CrawlerSelectorTextContains.php
+++ b/src/Symfony/Component/DomCrawler/Test/Constraint/CrawlerSelectorTextContains.php
@@ -45,7 +45,7 @@ protected function matches($crawler): bool
             return false;
         }
 
-        return false !== mb_strpos($crawler->text(null, true), $this->expectedText);
+        return str_contains($crawler->text(null, true), $this->expectedText);
     }
 
     /**
diff --git a/src/Symfony/Component/DomCrawler/UriResolver.php b/src/Symfony/Component/DomCrawler/UriResolver.php
index be64f5257018d..2356163a94d45 100644
--- a/src/Symfony/Component/DomCrawler/UriResolver.php
+++ b/src/Symfony/Component/DomCrawler/UriResolver.php
@@ -115,7 +115,7 @@ private static function cleanupUri(string $uri): string
      */
     private static function cleanupQuery(string $uri): string
     {
-        if (false !== $pos = strpos($uri, '?')) {
+        if ($pos = str_contains($uri, '?')) {
             return substr($uri, 0, $pos);
         }
 
@@ -127,7 +127,7 @@ private static function cleanupQuery(string $uri): string
      */
     private static function cleanupAnchor(string $uri): string
     {
-        if (false !== $pos = strpos($uri, '#')) {
+        if ($pos = str_contains($uri, '#')) {
             return substr($uri, 0, $pos);
         }
 
diff --git a/src/Symfony/Component/Dotenv/Dotenv.php b/src/Symfony/Component/Dotenv/Dotenv.php
index e1490af2bd93d..834c1f05ac2a8 100644
--- a/src/Symfony/Component/Dotenv/Dotenv.php
+++ b/src/Symfony/Component/Dotenv/Dotenv.php
@@ -181,7 +181,7 @@ public function populate(array $values, bool $overrideExistingVars = false): voi
         $loadedVars = array_flip(explode(',', $_SERVER['SYMFONY_DOTENV_VARS'] ?? $_ENV['SYMFONY_DOTENV_VARS'] ?? ''));
 
         foreach ($values as $name => $value) {
-            $notHttpName = 0 !== strpos($name, 'HTTP_');
+            $notHttpName = str_contains($name, 'HTTP_');
             // don't check existence with getenv() because of thread safety issues
             if (!isset($loadedVars[$name]) && (!$overrideExistingVars && (isset($_ENV[$name]) || (isset($_SERVER[$name]) && $notHttpName)))) {
                 continue;
@@ -453,7 +453,7 @@ private function resolveCommands(string $value, array $loadedVars): string
 
             $env = [];
             foreach ($this->values as $name => $value) {
-                if (isset($loadedVars[$name]) || (!isset($_ENV[$name]) && !(isset($_SERVER[$name]) && 0 !== strpos($name, 'HTTP_')))) {
+                if (isset($loadedVars[$name]) || (!isset($_ENV[$name]) && !(isset($_SERVER[$name]) && str_contains($name, 'HTTP_')))) {
                     $env[$name] = $value;
                 }
             }
@@ -506,7 +506,7 @@ private function resolveVariables(string $value, array $loadedVars): string
                 $value = $this->values[$name];
             } elseif (isset($_ENV[$name])) {
                 $value = $_ENV[$name];
-            } elseif (isset($_SERVER[$name]) && 0 !== strpos($name, 'HTTP_')) {
+            } elseif (isset($_SERVER[$name]) && str_contains($name, 'HTTP_')) {
                 $value = $_SERVER[$name];
             } elseif (isset($this->values[$name])) {
                 $value = $this->values[$name];
diff --git a/src/Symfony/Component/ErrorHandler/BufferingLogger.php b/src/Symfony/Component/ErrorHandler/BufferingLogger.php
index 72be64d1278a4..4c27685a845fb 100644
--- a/src/Symfony/Component/ErrorHandler/BufferingLogger.php
+++ b/src/Symfony/Component/ErrorHandler/BufferingLogger.php
@@ -48,7 +48,7 @@ public function __wakeup()
     public function __destruct()
     {
         foreach ($this->logs as [$level, $message, $context]) {
-            if (false !== strpos($message, '{')) {
+            if (str_contains($message, '{')) {
                 foreach ($context as $key => $val) {
                     if (null === $val || is_scalar($val) || (\is_object($val) && \is_callable([$val, '__toString']))) {
                         $message = str_replace("{{$key}}", $val, $message);
diff --git a/src/Symfony/Component/ErrorHandler/DebugClassLoader.php b/src/Symfony/Component/ErrorHandler/DebugClassLoader.php
index bf9b1d0455113..4117f4fc06dcf 100644
--- a/src/Symfony/Component/ErrorHandler/DebugClassLoader.php
+++ b/src/Symfony/Component/ErrorHandler/DebugClassLoader.php
@@ -391,7 +391,7 @@ private function checkClass(string $class, string $file = null): void
         }
 
         if (!$exists) {
-            if (false !== strpos($class, '/')) {
+            if (str_contains($class, '/')) {
                 throw new \RuntimeException(sprintf('Trying to autoload a class with an invalid name "%s". Be careful that the namespace separator is "\" in PHP, not "/".', $class));
             }
 
@@ -413,7 +413,7 @@ public function checkAnnotations(\ReflectionClass $refl, string $class): array
         }
         $deprecations = [];
 
-        $className = false !== strpos($class, "@anonymous\0") ? (get_parent_class($class) ?: key(class_implements($class)) ?: 'class').'@anonymous' : $class;
+        $className = str_contains($class, "@anonymous\0") ? (get_parent_class($class) ?: key(class_implements($class)) ?: 'class').'@anonymous' : $class;
 
         // Don't trigger deprecations for classes in the same vendor
         if ($class !== $className) {
@@ -429,12 +429,12 @@ public function checkAnnotations(\ReflectionClass $refl, string $class): array
         // Detect annotations on the class
         if (false !== $doc = $refl->getDocComment()) {
             foreach (['final', 'deprecated', 'internal'] as $annotation) {
-                if (false !== strpos($doc, $annotation) && preg_match('#\n\s+\* @'.$annotation.'(?:( .+?)\.?)?\r?\n\s+\*(?: @|/$|\r?\n)#s', $doc, $notice)) {
+                if (str_contains($doc, $annotation) && preg_match('#\n\s+\* @'.$annotation.'(?:( .+?)\.?)?\r?\n\s+\*(?: @|/$|\r?\n)#s', $doc, $notice)) {
                     self::${$annotation}[$class] = isset($notice[1]) ? preg_replace('#\.?\r?\n( \*)? *(?= |\r?\n|$)#', '', $notice[1]) : '';
                 }
             }
 
-            if ($refl->isInterface() && false !== strpos($doc, 'method') && preg_match_all('#\n \* @method\s+(static\s+)?+([\w\|&\[\]\\\]+\s+)?(\w+(?:\s*\([^\)]*\))?)+(.+?([[:punct:]]\s*)?)?(?=\r?\n \*(?: @|/$|\r?\n))#', $doc, $notice, \PREG_SET_ORDER)) {
+            if ($refl->isInterface() && str_contains($doc, 'method') && preg_match_all('#\n \* @method\s+(static\s+)?+([\w\|&\[\]\\\]+\s+)?(\w+(?:\s*\([^\)]*\))?)+(.+?([[:punct:]]\s*)?)?(?=\r?\n \*(?: @|/$|\r?\n))#', $doc, $notice, \PREG_SET_ORDER)) {
                 foreach ($notice as $method) {
                     $static = '' !== $method[1] && !empty($method[2]);
                     $name = $method[3];
@@ -596,7 +596,7 @@ public function checkAnnotations(\ReflectionClass $refl, string $class): array
                     $this->patchTypes['force'] = $forcePatchTypes ?: 'docblock';
                 }
 
-                $canAddReturnType = false !== strpos($refl->getFileName(), \DIRECTORY_SEPARATOR.'Tests'.\DIRECTORY_SEPARATOR)
+                $canAddReturnType = str_contains($refl->getFileName(), \DIRECTORY_SEPARATOR.'Tests'.\DIRECTORY_SEPARATOR)
                     || $refl->isFinal()
                     || $method->isFinal()
                     || $method->isPrivate()
@@ -634,7 +634,7 @@ public function checkAnnotations(\ReflectionClass $refl, string $class): array
 
             $matches = [];
 
-            if (!$method->hasReturnType() && ((false !== strpos($doc, '@return') && preg_match('/\n\s+\* @return +([^\s<(]+)/', $doc, $matches)) || 'void' !== (self::MAGIC_METHODS[$method->name] ?? 'void'))) {
+            if (!$method->hasReturnType() && ((str_contains($doc, '@return') && preg_match('/\n\s+\* @return +([^\s<(]+)/', $doc, $matches)) || 'void' !== (self::MAGIC_METHODS[$method->name] ?? 'void'))) {
                 $matches = $matches ?: [1 => self::MAGIC_METHODS[$method->name]];
                 $this->setReturnType($matches[1], $method, $parent);
 
@@ -656,7 +656,7 @@ public function checkAnnotations(\ReflectionClass $refl, string $class): array
             $finalOrInternal = false;
 
             foreach (['final', 'internal'] as $annotation) {
-                if (false !== strpos($doc, $annotation) && preg_match('#\n\s+\* @'.$annotation.'(?:( .+?)\.?)?\r?\n\s+\*(?: @|/$|\r?\n)#s', $doc, $notice)) {
+                if (str_contains($doc, $annotation) && preg_match('#\n\s+\* @'.$annotation.'(?:( .+?)\.?)?\r?\n\s+\*(?: @|/$|\r?\n)#s', $doc, $notice)) {
                     $message = isset($notice[1]) ? preg_replace('#\.?\r?\n( \*)? *(?= |\r?\n|$)#', '', $notice[1]) : '';
                     self::${$annotation.'Methods'}[$class][$method->name] = [$class, $message];
                     $finalOrInternal = true;
@@ -844,7 +844,7 @@ private function setReturnType(string $types, \ReflectionMethod $method, ?string
         $iterable = $object = true;
         foreach ($typesMap as $n => $t) {
             if ('null' !== $n) {
-                $iterable = $iterable && (\in_array($n, ['array', 'iterable']) || false !== strpos($n, 'Iterator'));
+                $iterable = $iterable && (\in_array($n, ['array', 'iterable']) || str_contains($n, 'Iterator'));
                 $object = $object && (\in_array($n, ['callable', 'object', '$this', 'static']) || !isset(self::SPECIAL_RETURN_TYPES[$n]));
             }
         }
diff --git a/src/Symfony/Component/ErrorHandler/ErrorEnhancer/UndefinedFunctionErrorEnhancer.php b/src/Symfony/Component/ErrorHandler/ErrorEnhancer/UndefinedFunctionErrorEnhancer.php
index f4c49c2856c22..282f2f6331008 100644
--- a/src/Symfony/Component/ErrorHandler/ErrorEnhancer/UndefinedFunctionErrorEnhancer.php
+++ b/src/Symfony/Component/ErrorHandler/ErrorEnhancer/UndefinedFunctionErrorEnhancer.php
@@ -42,7 +42,7 @@ public function enhance(\Throwable $error): ?\Throwable
 
         $prefix = 'Call to undefined function ';
         $prefixLen = \strlen($prefix);
-        if (0 !== strpos($message, $prefix)) {
+        if (str_contains($message, $prefix)) {
             return null;
         }
 
diff --git a/src/Symfony/Component/ErrorHandler/ErrorEnhancer/UndefinedMethodErrorEnhancer.php b/src/Symfony/Component/ErrorHandler/ErrorEnhancer/UndefinedMethodErrorEnhancer.php
index c4355f92ce089..d5eb6d6b1e4a6 100644
--- a/src/Symfony/Component/ErrorHandler/ErrorEnhancer/UndefinedMethodErrorEnhancer.php
+++ b/src/Symfony/Component/ErrorHandler/ErrorEnhancer/UndefinedMethodErrorEnhancer.php
@@ -47,7 +47,7 @@ public function enhance(\Throwable $error): ?\Throwable
         $candidates = [];
         foreach ($methods as $definedMethodName) {
             $lev = levenshtein($methodName, $definedMethodName);
-            if ($lev <= \strlen($methodName) / 3 || false !== strpos($definedMethodName, $methodName)) {
+            if ($lev <= \strlen($methodName) / 3 || str_contains($definedMethodName, $methodName)) {
                 $candidates[] = $definedMethodName;
             }
         }
diff --git a/src/Symfony/Component/ErrorHandler/ErrorHandler.php b/src/Symfony/Component/ErrorHandler/ErrorHandler.php
index d1994f090180c..b97694ca5d8d7 100644
--- a/src/Symfony/Component/ErrorHandler/ErrorHandler.php
+++ b/src/Symfony/Component/ErrorHandler/ErrorHandler.php
@@ -387,7 +387,7 @@ private function reRegister(int $prev): void
      */
     public function handleError(int $type, string $message, string $file, int $line): bool
     {
-        if (\E_WARNING === $type && '"' === $message[0] && false !== strpos($message, '" targeting switch is equivalent to "break')) {
+        if (\E_WARNING === $type && '"' === $message[0] && str_contains($message, '" targeting switch is equivalent to "break')) {
             $type = \E_DEPRECATED;
         }
 
@@ -438,7 +438,7 @@ public function handleError(int $type, string $message, string $file, int $line)
                 return true;
             }
         } else {
-            if (false !== strpos($message, '@anonymous')) {
+            if (str_contains($message, '@anonymous')) {
                 $backtrace = debug_backtrace(false, 5);
 
                 for ($i = 1; isset($backtrace[$i]); ++$i) {
@@ -504,7 +504,7 @@ public function handleException(\Throwable $exception)
         }
 
         if ($this->loggedErrors & $type) {
-            if (false !== strpos($message = $exception->getMessage(), "@anonymous\0")) {
+            if (str_contains($message = $exception->getMessage(), "@anonymous\0")) {
                 $message = $this->parseAnonymousClass($message);
             }
 
diff --git a/src/Symfony/Component/ErrorHandler/ErrorRenderer/HtmlErrorRenderer.php b/src/Symfony/Component/ErrorHandler/ErrorRenderer/HtmlErrorRenderer.php
index 88ec4ed566f0e..a11fe080b95d0 100644
--- a/src/Symfony/Component/ErrorHandler/ErrorRenderer/HtmlErrorRenderer.php
+++ b/src/Symfony/Component/ErrorHandler/ErrorRenderer/HtmlErrorRenderer.php
@@ -313,7 +313,7 @@ private function formatFileFromText(string $text)
 
     private function formatLogMessage(string $message, array $context)
     {
-        if ($context && false !== strpos($message, '{')) {
+        if ($context && str_contains($message, '{')) {
             $replacements = [];
             foreach ($context as $key => $val) {
                 if (is_scalar($val)) {
diff --git a/src/Symfony/Component/ErrorHandler/Exception/FlattenException.php b/src/Symfony/Component/ErrorHandler/Exception/FlattenException.php
index f6f0f6fe408ee..4ffaacb9990ef 100644
--- a/src/Symfony/Component/ErrorHandler/Exception/FlattenException.php
+++ b/src/Symfony/Component/ErrorHandler/Exception/FlattenException.php
@@ -165,7 +165,7 @@ public function getClass(): string
      */
     public function setClass(string $class): self
     {
-        $this->class = false !== strpos($class, "@anonymous\0") ? (get_parent_class($class) ?: key(class_implements($class)) ?: 'class').'@anonymous' : $class;
+        $this->class = str_contains($class, "@anonymous\0") ? (get_parent_class($class) ?: key(class_implements($class)) ?: 'class').'@anonymous' : $class;
 
         return $this;
     }
@@ -222,7 +222,7 @@ public function getMessage(): string
      */
     public function setMessage(string $message): self
     {
-        if (false !== strpos($message, "@anonymous\0")) {
+        if (str_contains($message, "@anonymous\0")) {
             $message = preg_replace_callback('/[a-zA-Z_\x7f-\xff][\\\\a-zA-Z0-9_\x7f-\xff]*+@anonymous\x00.*?\.php(?:0x?|:[0-9]++\$)[0-9a-fA-F]++/', function ($m) {
                 return class_exists($m[0], false) ? (get_parent_class($m[0]) ?: key(class_implements($m[0])) ?: 'class').'@anonymous' : $m[0];
             }, $message);
diff --git a/src/Symfony/Component/EventDispatcher/Debug/WrappedListener.php b/src/Symfony/Component/EventDispatcher/Debug/WrappedListener.php
index 7df21922aa38e..c2fe127dcf562 100644
--- a/src/Symfony/Component/EventDispatcher/Debug/WrappedListener.php
+++ b/src/Symfony/Component/EventDispatcher/Debug/WrappedListener.php
@@ -45,7 +45,7 @@ public function __construct(callable|array $listener, ?string $name, Stopwatch $
             $this->pretty = $this->name.'::'.$listener[1];
         } elseif ($listener instanceof \Closure) {
             $r = new \ReflectionFunction($listener);
-            if (false !== strpos($r->name, '{closure}')) {
+            if (str_contains($r->name, '{closure}')) {
                 $this->pretty = $this->name = 'closure';
             } elseif ($class = $r->getClosureScopeClass()) {
                 $this->name = $class->name;
diff --git a/src/Symfony/Component/ExpressionLanguage/Lexer.php b/src/Symfony/Component/ExpressionLanguage/Lexer.php
index 6e3cc488b1ee3..a8966f6fa52fb 100644
--- a/src/Symfony/Component/ExpressionLanguage/Lexer.php
+++ b/src/Symfony/Component/ExpressionLanguage/Lexer.php
@@ -48,13 +48,13 @@ public function tokenize(string $expression)
                 }
                 $tokens[] = new Token(Token::NUMBER_TYPE, $number, $cursor + 1);
                 $cursor += \strlen($match[0]);
-            } elseif (false !== strpos('([{', $expression[$cursor])) {
+            } elseif (str_contains('([{', $expression[$cursor])) {
                 // opening bracket
                 $brackets[] = [$expression[$cursor], $cursor];
 
                 $tokens[] = new Token(Token::PUNCTUATION_TYPE, $expression[$cursor], $cursor + 1);
                 ++$cursor;
-            } elseif (false !== strpos(')]}', $expression[$cursor])) {
+            } elseif (str_contains(')]}', $expression[$cursor])) {
                 // closing bracket
                 if (empty($brackets)) {
                     throw new SyntaxError(sprintf('Unexpected "%s".', $expression[$cursor]), $cursor, $expression);
@@ -75,7 +75,7 @@ public function tokenize(string $expression)
                 // operators
                 $tokens[] = new Token(Token::OPERATOR_TYPE, $match[0], $cursor + 1);
                 $cursor += \strlen($match[0]);
-            } elseif (false !== strpos('.,?:', $expression[$cursor])) {
+            } elseif (str_contains('.,?:', $expression[$cursor])) {
                 // punctuation
                 $tokens[] = new Token(Token::PUNCTUATION_TYPE, $expression[$cursor], $cursor + 1);
                 ++$cursor;
diff --git a/src/Symfony/Component/Filesystem/Filesystem.php b/src/Symfony/Component/Filesystem/Filesystem.php
index 1c75347cbba42..7acf53073a6ab 100644
--- a/src/Symfony/Component/Filesystem/Filesystem.php
+++ b/src/Symfony/Component/Filesystem/Filesystem.php
@@ -192,7 +192,7 @@ private static function doRemove(array $files, bool $isRecursive): void
 
                     throw new IOException(sprintf('Failed to remove directory "%s": ', $file).$lastError);
                 }
-            } elseif (!self::box('unlink', $file) && (false !== strpos(self::$lastError, 'Permission denied') || file_exists($file))) {
+            } elseif (!self::box('unlink', $file) && (str_contains(self::$lastError, 'Permission denied') || file_exists($file))) {
                 throw new IOException(sprintf('Failed to remove file "%s": ', $file).self::$lastError);
             }
         }
@@ -382,7 +382,7 @@ public function hardlink(string $originFile, string|iterable $targetFiles)
     private function linkException(string $origin, string $target, string $linkType)
     {
         if (self::$lastError) {
-            if ('\\' === \DIRECTORY_SEPARATOR && false !== strpos(self::$lastError, 'error code(1314)')) {
+            if ('\\' === \DIRECTORY_SEPARATOR && str_contains(self::$lastError, 'error code(1314)')) {
                 throw new IOException(sprintf('Unable to create "%s" link due to error code 1314: \'A required privilege is not held by the client\'. Do you have the required Administrator-rights?', $linkType), 0, null, $target);
             }
         }
diff --git a/src/Symfony/Component/Filesystem/Tests/FilesystemTestCase.php b/src/Symfony/Component/Filesystem/Tests/FilesystemTestCase.php
index 76cfb9f9ff8cb..725870c69857a 100644
--- a/src/Symfony/Component/Filesystem/Tests/FilesystemTestCase.php
+++ b/src/Symfony/Component/Filesystem/Tests/FilesystemTestCase.php
@@ -48,7 +48,7 @@ public static function setUpBeforeClass(): void
             $targetFile = tempnam(sys_get_temp_dir(), 'li');
             if (true !== @link($originFile, $targetFile)) {
                 $report = error_get_last();
-                if (\is_array($report) && false !== strpos($report['message'], 'error code(1314)')) {
+                if (\is_array($report) && str_contains($report['message'], 'error code(1314)')) {
                     self::$linkOnWindows = false;
                 }
             } else {
@@ -60,7 +60,7 @@ public static function setUpBeforeClass(): void
             $targetDir = tempnam(sys_get_temp_dir(), 'sl');
             if (true !== @symlink($originDir, $targetDir)) {
                 $report = error_get_last();
-                if (\is_array($report) && false !== strpos($report['message'], 'error code(1314)')) {
+                if (\is_array($report) && str_contains($report['message'], 'error code(1314)')) {
                     self::$symlinkOnWindows = false;
                 }
             } else {
diff --git a/src/Symfony/Component/Finder/Iterator/ExcludeDirectoryFilterIterator.php b/src/Symfony/Component/Finder/Iterator/ExcludeDirectoryFilterIterator.php
index 8e11b48864b8a..df8a9a05d73d3 100644
--- a/src/Symfony/Component/Finder/Iterator/ExcludeDirectoryFilterIterator.php
+++ b/src/Symfony/Component/Finder/Iterator/ExcludeDirectoryFilterIterator.php
@@ -34,7 +34,7 @@ public function __construct(\Iterator $iterator, array $directories)
         $patterns = [];
         foreach ($directories as $directory) {
             $directory = rtrim($directory, '/');
-            if (!$this->isRecursive || false !== strpos($directory, '/')) {
+            if (!$this->isRecursive || str_contains($directory, '/')) {
                 $patterns[] = preg_quote($directory, '#');
             } else {
                 $this->excludedDirs[$directory] = true;
diff --git a/src/Symfony/Component/Finder/Tests/FinderTest.php b/src/Symfony/Component/Finder/Tests/FinderTest.php
index 83e3a01e3106a..f005433d94c42 100644
--- a/src/Symfony/Component/Finder/Tests/FinderTest.php
+++ b/src/Symfony/Component/Finder/Tests/FinderTest.php
@@ -869,7 +869,7 @@ public function testSortAcrossDirectories()
     public function testFilter()
     {
         $finder = $this->buildFinder();
-        $this->assertSame($finder, $finder->filter(function (\SplFileInfo $f) { return false !== strpos($f, 'test'); }));
+        $this->assertSame($finder, $finder->filter(function (\SplFileInfo $f) { return str_contains($f, 'test'); }));
         $this->assertIterator($this->toAbsolute(['test.php', 'test.py']), $finder->in(self::$tmpDir)->getIterator());
     }
 
diff --git a/src/Symfony/Component/Finder/Tests/Iterator/MockSplFileInfo.php b/src/Symfony/Component/Finder/Tests/Iterator/MockSplFileInfo.php
index bc80ed2e1e856..028e35845251d 100644
--- a/src/Symfony/Component/Finder/Tests/Iterator/MockSplFileInfo.php
+++ b/src/Symfony/Component/Finder/Tests/Iterator/MockSplFileInfo.php
@@ -51,7 +51,7 @@ public function __construct($param)
     public function isFile(): bool
     {
         if (null === $this->type) {
-            return false !== strpos($this->getFilename(), 'file');
+            return str_contains($this->getFilename(), 'file');
         }
 
         return self::TYPE_FILE === $this->type;
@@ -60,7 +60,7 @@ public function isFile(): bool
     public function isDir(): bool
     {
         if (null === $this->type) {
-            return false !== strpos($this->getFilename(), 'directory');
+            return str_contains($this->getFilename(), 'directory');
         }
 
         return self::TYPE_DIRECTORY === $this->type;
diff --git a/src/Symfony/Component/Form/Command/DebugCommand.php b/src/Symfony/Component/Form/Command/DebugCommand.php
index fa97d9d51e126..cc5f0dcca3b50 100644
--- a/src/Symfony/Component/Form/Command/DebugCommand.php
+++ b/src/Symfony/Component/Form/Command/DebugCommand.php
@@ -231,7 +231,7 @@ private function findAlternatives(string $name, array $collection): array
         $alternatives = [];
         foreach ($collection as $item) {
             $lev = levenshtein($name, $item);
-            if ($lev <= \strlen($name) / 3 || false !== strpos($item, $name)) {
+            if ($lev <= \strlen($name) / 3 || str_contains($item, $name)) {
                 $alternatives[$item] = isset($alternatives[$item]) ? $alternatives[$item] - $lev : $lev;
             }
         }
diff --git a/src/Symfony/Component/Form/Extension/Core/DataTransformer/IntegerToLocalizedStringTransformer.php b/src/Symfony/Component/Form/Extension/Core/DataTransformer/IntegerToLocalizedStringTransformer.php
index 04c20b54eefa4..0ac2904f90793 100644
--- a/src/Symfony/Component/Form/Extension/Core/DataTransformer/IntegerToLocalizedStringTransformer.php
+++ b/src/Symfony/Component/Form/Extension/Core/DataTransformer/IntegerToLocalizedStringTransformer.php
@@ -40,7 +40,7 @@ public function reverseTransform(mixed $value)
     {
         $decimalSeparator = $this->getNumberFormatter()->getSymbol(\NumberFormatter::DECIMAL_SEPARATOR_SYMBOL);
 
-        if (\is_string($value) && false !== strpos($value, $decimalSeparator)) {
+        if (\is_string($value) && str_contains($value, $decimalSeparator)) {
             throw new TransformationFailedException(sprintf('The value "%s" is not a valid integer.', $value));
         }
 
diff --git a/src/Symfony/Component/Form/Extension/Core/DataTransformer/NumberToLocalizedStringTransformer.php b/src/Symfony/Component/Form/Extension/Core/DataTransformer/NumberToLocalizedStringTransformer.php
index 6885c11867eeb..28d7433c458fe 100644
--- a/src/Symfony/Component/Form/Extension/Core/DataTransformer/NumberToLocalizedStringTransformer.php
+++ b/src/Symfony/Component/Form/Extension/Core/DataTransformer/NumberToLocalizedStringTransformer.php
@@ -108,7 +108,7 @@ public function reverseTransform(mixed $value)
             $value = str_replace(',', $decSep, $value);
         }
 
-        if (false !== strpos($value, $decSep)) {
+        if (str_contains($value, $decSep)) {
             $type = \NumberFormatter::TYPE_DOUBLE;
         } else {
             $type = \PHP_INT_SIZE === 8
diff --git a/src/Symfony/Component/Form/Extension/Core/DataTransformer/PercentToLocalizedStringTransformer.php b/src/Symfony/Component/Form/Extension/Core/DataTransformer/PercentToLocalizedStringTransformer.php
index 0d80ee2f92399..aac6cff361bbd 100644
--- a/src/Symfony/Component/Form/Extension/Core/DataTransformer/PercentToLocalizedStringTransformer.php
+++ b/src/Symfony/Component/Form/Extension/Core/DataTransformer/PercentToLocalizedStringTransformer.php
@@ -129,7 +129,7 @@ public function reverseTransform(mixed $value)
             $value = str_replace(',', $decSep, $value);
         }
 
-        if (false !== strpos($value, $decSep)) {
+        if (str_contains($value, $decSep)) {
             $type = \NumberFormatter::TYPE_DOUBLE;
         } else {
             $type = \PHP_INT_SIZE === 8 ? \NumberFormatter::TYPE_INT64 : \NumberFormatter::TYPE_INT32;
diff --git a/src/Symfony/Component/Form/Extension/Validator/ViolationMapper/ViolationMapper.php b/src/Symfony/Component/Form/Extension/Validator/ViolationMapper/ViolationMapper.php
index 1982e85d8b656..b64d0dbaae655 100644
--- a/src/Symfony/Component/Form/Extension/Validator/ViolationMapper/ViolationMapper.php
+++ b/src/Symfony/Component/Form/Extension/Validator/ViolationMapper/ViolationMapper.php
@@ -153,7 +153,7 @@ public function mapViolation(ConstraintViolation $violation, FormInterface $form
             $message = $violation->getMessage();
             $messageTemplate = $violation->getMessageTemplate();
 
-            if (false !== strpos($message, '{{ label }}') || false !== strpos($messageTemplate, '{{ label }}')) {
+            if (str_contains($message, '{{ label }}') || str_contains($messageTemplate, '{{ label }}')) {
                 $form = $scope;
 
                 do {
diff --git a/src/Symfony/Component/HttpClient/CurlHttpClient.php b/src/Symfony/Component/HttpClient/CurlHttpClient.php
index 1c565e9f7a680..bc796d3f9551a 100644
--- a/src/Symfony/Component/HttpClient/CurlHttpClient.php
+++ b/src/Symfony/Component/HttpClient/CurlHttpClient.php
@@ -272,7 +272,7 @@ public function request(string $method, string $url, array $options = []): Respo
         if ($options['bindto']) {
             if (file_exists($options['bindto'])) {
                 $curlopts[\CURLOPT_UNIX_SOCKET_PATH] = $options['bindto'];
-            } elseif (0 !== strpos($options['bindto'], 'if!') && preg_match('/^(.*):(\d+)$/', $options['bindto'], $matches)) {
+            } elseif (str_contains($options['bindto'], 'if!') && preg_match('/^(.*):(\d+)$/', $options['bindto'], $matches)) {
                 $curlopts[\CURLOPT_INTERFACE] = $matches[1];
                 $curlopts[\CURLOPT_LOCALPORT] = $matches[2];
             } else {
@@ -382,7 +382,7 @@ private function handlePush($parent, $pushed, array $requestHeaders, int $maxPen
         // curl before 7.65 doesn't validate the pushed ":authority" header,
         // but this is a MUST in the HTTP/2 RFC; let's restrict pushes to the original host,
         // ignoring domains mentioned as alt-name in the certificate for now (same as curl).
-        if (0 !== strpos($origin, $url.'/')) {
+        if (str_contains($origin, $url.'/')) {
             $this->logger && $this->logger->debug(sprintf('Rejecting pushed response from "%s": server is not authoritative for "%s"', $origin, $url));
 
             return \CURL_PUSH_DENY;
diff --git a/src/Symfony/Component/HttpClient/HttpClientTrait.php b/src/Symfony/Component/HttpClient/HttpClientTrait.php
index 4dc279d1e9713..cab67984d83c2 100644
--- a/src/Symfony/Component/HttpClient/HttpClientTrait.php
+++ b/src/Symfony/Component/HttpClient/HttpClientTrait.php
@@ -227,7 +227,7 @@ private static function mergeDefaultOptions(array $options, array $defaultOption
             $alternatives = [];
 
             foreach ($defaultOptions as $key => $v) {
-                if (levenshtein($name, $key) <= \strlen($name) / 3 || false !== strpos($key, $name)) {
+                if (levenshtein($name, $key) <= \strlen($name) / 3 || str_contains($key, $name)) {
                     $alternatives[] = $key;
                 }
             }
@@ -486,7 +486,7 @@ private static function parseUrl(string $url, array $query = [], array $allowedS
                 continue;
             }
 
-            if (false !== strpos($parts[$part], '%')) {
+            if (str_contains($parts[$part], '%')) {
                 // https://tools.ietf.org/html/rfc3986#section-2.3
                 $parts[$part] = preg_replace_callback('/%(?:2[DE]|3[0-9]|[46][1-9A-F]|5F|[57][0-9A]|7E)++/i', function ($m) { return rawurldecode($m[0]); }, $parts[$part]);
             }
diff --git a/src/Symfony/Component/HttpClient/Internal/AmpListener.php b/src/Symfony/Component/HttpClient/Internal/AmpListener.php
index cb3235bca3ff6..70be7a26997f9 100644
--- a/src/Symfony/Component/HttpClient/Internal/AmpListener.php
+++ b/src/Symfony/Component/HttpClient/Internal/AmpListener.php
@@ -81,7 +81,7 @@ public function startSendingRequest(Request $request, Stream $stream): Promise
     {
         $host = $stream->getRemoteAddress()->getHost();
 
-        if (false !== strpos($host, ':')) {
+        if (str_contains($host, ':')) {
             $host = '['.$host.']';
         }
 
diff --git a/src/Symfony/Component/HttpClient/Response/CurlResponse.php b/src/Symfony/Component/HttpClient/Response/CurlResponse.php
index 585fdb933a286..7a00b1342a4cf 100644
--- a/src/Symfony/Component/HttpClient/Response/CurlResponse.php
+++ b/src/Symfony/Component/HttpClient/Response/CurlResponse.php
@@ -374,7 +374,7 @@ private static function parseHeaderLine($ch, string $data, array &$info, array &
                 return \strlen($data);
             }
 
-            if (0 !== strpos($data, 'HTTP/')) {
+            if (str_contains($data, 'HTTP/')) {
                 if (0 === stripos($data, 'Location:')) {
                     $location = trim(substr($data, 9));
                 }
diff --git a/src/Symfony/Component/HttpClient/Tests/CurlHttpClientTest.php b/src/Symfony/Component/HttpClient/Tests/CurlHttpClientTest.php
index 1618b123c8cc9..01299e26f7eef 100644
--- a/src/Symfony/Component/HttpClient/Tests/CurlHttpClientTest.php
+++ b/src/Symfony/Component/HttpClient/Tests/CurlHttpClientTest.php
@@ -22,7 +22,7 @@ class CurlHttpClientTest extends HttpClientTestCase
 {
     protected function getHttpClient(string $testCase): HttpClientInterface
     {
-        if (false !== strpos($testCase, 'Push')) {
+        if (str_contains($testCase, 'Push')) {
             if (!\defined('CURLMOPT_PUSHFUNCTION') || 0x073d00 > ($v = curl_version())['version_number'] || !(\CURL_VERSION_HTTP2 & $v['features'])) {
                 $this->markTestSkipped('curl <7.61 is used or it is not compiled with support for HTTP/2 PUSH');
             }
diff --git a/src/Symfony/Component/HttpFoundation/BinaryFileResponse.php b/src/Symfony/Component/HttpFoundation/BinaryFileResponse.php
index cea0463981e51..64b0940c6f19e 100644
--- a/src/Symfony/Component/HttpFoundation/BinaryFileResponse.php
+++ b/src/Symfony/Component/HttpFoundation/BinaryFileResponse.php
@@ -138,7 +138,7 @@ public function setContentDisposition(string $disposition, string $filename = ''
             $filename = $this->file->getFilename();
         }
 
-        if ('' === $filenameFallback && (!preg_match('/^[\x20-\x7e]*$/', $filename) || false !== strpos($filename, '%'))) {
+        if ('' === $filenameFallback && (!preg_match('/^[\x20-\x7e]*$/', $filename) || str_contains($filename, '%'))) {
             $encoding = mb_detect_encoding($filename, null, true) ?: '8bit';
 
             for ($i = 0, $filenameLength = mb_strlen($filename, $encoding); $i < $filenameLength; ++$i) {
diff --git a/src/Symfony/Component/HttpFoundation/HeaderUtils.php b/src/Symfony/Component/HttpFoundation/HeaderUtils.php
index 1824ac336d57b..8ef870284d5c5 100644
--- a/src/Symfony/Component/HttpFoundation/HeaderUtils.php
+++ b/src/Symfony/Component/HttpFoundation/HeaderUtils.php
@@ -176,12 +176,12 @@ public static function makeDisposition(string $disposition, string $filename, st
         }
 
         // percent characters aren't safe in fallback.
-        if (false !== strpos($filenameFallback, '%')) {
+        if (str_contains($filenameFallback, '%')) {
             throw new \InvalidArgumentException('The filename fallback cannot contain the "%" character.');
         }
 
         // path separators aren't allowed in either.
-        if (false !== strpos($filename, '/') || false !== strpos($filename, '\\') || false !== strpos($filenameFallback, '/') || false !== strpos($filenameFallback, '\\')) {
+        if (str_contains($filename, '/') || str_contains($filename, '\\') || str_contains($filenameFallback, '/') || str_contains($filenameFallback, '\\')) {
             throw new \InvalidArgumentException('The filename and the fallback cannot contain the "/" and "\\" characters.');
         }
 
diff --git a/src/Symfony/Component/HttpFoundation/IpUtils.php b/src/Symfony/Component/HttpFoundation/IpUtils.php
index 70738c8d5ed6e..8349867d80d72 100644
--- a/src/Symfony/Component/HttpFoundation/IpUtils.php
+++ b/src/Symfony/Component/HttpFoundation/IpUtils.php
@@ -70,7 +70,7 @@ public static function checkIp4(?string $requestIp, string $ip)
             return self::$checkedIps[$cacheKey] = false;
         }
 
-        if (false !== strpos($ip, '/')) {
+        if (str_contains($ip, '/')) {
             [$address, $netmask] = explode('/', $ip, 2);
 
             if ('0' === $netmask) {
@@ -117,7 +117,7 @@ public static function checkIp6(?string $requestIp, string $ip)
             throw new \RuntimeException('Unable to check Ipv6. Check that PHP was not compiled with option "disable-ipv6".');
         }
 
-        if (false !== strpos($ip, '/')) {
+        if (str_contains($ip, '/')) {
             [$address, $netmask] = explode('/', $ip, 2);
 
             if ('0' === $netmask) {
diff --git a/src/Symfony/Component/HttpFoundation/Request.php b/src/Symfony/Component/HttpFoundation/Request.php
index 6324221fa3ee9..c66434271f84d 100644
--- a/src/Symfony/Component/HttpFoundation/Request.php
+++ b/src/Symfony/Component/HttpFoundation/Request.php
@@ -1666,7 +1666,7 @@ public function getLanguages()
         $languages = AcceptHeader::fromString($this->headers->get('Accept-Language'))->all();
         $this->languages = [];
         foreach ($languages as $lang => $acceptHeaderItem) {
-            if (false !== strpos($lang, '-')) {
+            if (str_contains($lang, '-')) {
                 $codes = explode('-', $lang);
                 if ('i' === $codes[0]) {
                     // Language not listed in ISO 639 that are not variants
@@ -1991,7 +1991,7 @@ private function setPhpDefaultLocale(string $locale): void
      */
     private function getUrlencodedPrefix(string $string, string $prefix): ?string
     {
-        if (0 !== strpos(rawurldecode($string), $prefix)) {
+        if (str_contains(rawurldecode($string), $prefix)) {
             return null;
         }
 
diff --git a/src/Symfony/Component/HttpFoundation/Response.php b/src/Symfony/Component/HttpFoundation/Response.php
index 7c129f4f573ac..ee7462ff0ac59 100644
--- a/src/Symfony/Component/HttpFoundation/Response.php
+++ b/src/Symfony/Component/HttpFoundation/Response.php
@@ -303,7 +303,7 @@ public function prepare(Request $request)
         }
 
         // Check if we need to send extra expire info headers
-        if ('1.0' == $this->getProtocolVersion() && false !== strpos($headers->get('Cache-Control'), 'no-cache')) {
+        if ('1.0' == $this->getProtocolVersion() && str_contains($headers->get('Cache-Control'), 'no-cache')) {
             $headers->set('pragma', 'no-cache');
             $headers->set('expires', -1);
         }
@@ -905,7 +905,7 @@ public function setEtag(string $etag = null, bool $weak = false): object
         if (null === $etag) {
             $this->headers->remove('Etag');
         } else {
-            if (0 !== strpos($etag, '"')) {
+            if (str_contains($etag, '"')) {
                 $etag = '"'.$etag.'"';
             }
 
diff --git a/src/Symfony/Component/HttpFoundation/Session/Storage/Handler/PdoSessionHandler.php b/src/Symfony/Component/HttpFoundation/Session/Storage/Handler/PdoSessionHandler.php
index f8be4462f86bb..23453259f7bb5 100644
--- a/src/Symfony/Component/HttpFoundation/Session/Storage/Handler/PdoSessionHandler.php
+++ b/src/Symfony/Component/HttpFoundation/Session/Storage/Handler/PdoSessionHandler.php
@@ -179,7 +179,7 @@ public function __construct(\PDO|string $pdoOrDsn = null, array $options = [])
 
             $this->pdo = $pdoOrDsn;
             $this->driver = $this->pdo->getAttribute(\PDO::ATTR_DRIVER_NAME);
-        } elseif (\is_string($pdoOrDsn) && false !== strpos($pdoOrDsn, '://')) {
+        } elseif (\is_string($pdoOrDsn) && str_contains($pdoOrDsn, '://')) {
             $this->dsn = $this->buildDsnFromUrl($pdoOrDsn);
         } else {
             $this->dsn = $pdoOrDsn;
diff --git a/src/Symfony/Component/HttpFoundation/UrlHelper.php b/src/Symfony/Component/HttpFoundation/UrlHelper.php
index 0f417130afb0b..c15f101cdf80b 100644
--- a/src/Symfony/Component/HttpFoundation/UrlHelper.php
+++ b/src/Symfony/Component/HttpFoundation/UrlHelper.php
@@ -31,7 +31,7 @@ public function __construct(RequestStack $requestStack, RequestContext $requestC
 
     public function getAbsoluteUrl(string $path): string
     {
-        if (false !== strpos($path, '://') || '//' === substr($path, 0, 2)) {
+        if (str_contains($path, '://') || '//' === substr($path, 0, 2)) {
             return $path;
         }
 
@@ -60,7 +60,7 @@ public function getAbsoluteUrl(string $path): string
 
     public function getRelativePath(string $path): string
     {
-        if (false !== strpos($path, '://') || '//' === substr($path, 0, 2)) {
+        if (str_contains($path, '://') || '//' === substr($path, 0, 2)) {
             return $path;
         }
 
diff --git a/src/Symfony/Component/HttpKernel/Controller/ControllerResolver.php b/src/Symfony/Component/HttpKernel/Controller/ControllerResolver.php
index b0bf578759135..2a6180cb54b40 100644
--- a/src/Symfony/Component/HttpKernel/Controller/ControllerResolver.php
+++ b/src/Symfony/Component/HttpKernel/Controller/ControllerResolver.php
@@ -143,7 +143,7 @@ protected function instantiateController(string $class)
     private function getControllerError(mixed $callable): string
     {
         if (\is_string($callable)) {
-            if (false !== strpos($callable, '::')) {
+            if (str_contains($callable, '::')) {
                 $callable = explode('::', $callable, 2);
             } else {
                 return sprintf('Function "%s" does not exist.', $callable);
@@ -184,7 +184,7 @@ private function getControllerError(mixed $callable): string
         foreach ($collection as $item) {
             $lev = levenshtein($method, $item);
 
-            if ($lev <= \strlen($method) / 3 || false !== strpos($item, $method)) {
+            if ($lev <= \strlen($method) / 3 || str_contains($item, $method)) {
                 $alternatives[] = $item;
             }
         }
diff --git a/src/Symfony/Component/HttpKernel/DataCollector/DumpDataCollector.php b/src/Symfony/Component/HttpKernel/DataCollector/DumpDataCollector.php
index 09d3700eea088..3dd1ae84b171f 100644
--- a/src/Symfony/Component/HttpKernel/DataCollector/DumpDataCollector.php
+++ b/src/Symfony/Component/HttpKernel/DataCollector/DumpDataCollector.php
@@ -115,7 +115,7 @@ public function collect(Request $request, Response $response, \Throwable $except
             || 'html' !== $request->getRequestFormat()
             || false === strripos($response->getContent(), '</body>')
         ) {
-            if ($response->headers->has('Content-Type') && false !== strpos($response->headers->get('Content-Type'), 'html')) {
+            if ($response->headers->has('Content-Type') && str_contains($response->headers->get('Content-Type'), 'html')) {
                 $dumper = new HtmlDumper('php://output', $this->charset);
                 $dumper->setDisplayOptions(['fileLinkFormat' => $this->fileLinkFormat]);
             } else {
diff --git a/src/Symfony/Component/HttpKernel/DataCollector/RequestDataCollector.php b/src/Symfony/Component/HttpKernel/DataCollector/RequestDataCollector.php
index c075ed02f6ade..71fe765842461 100644
--- a/src/Symfony/Component/HttpKernel/DataCollector/RequestDataCollector.php
+++ b/src/Symfony/Component/HttpKernel/DataCollector/RequestDataCollector.php
@@ -433,7 +433,7 @@ public function collectSessionUsage(): void
      */
     protected function parseController(array|object|string|null $controller)
     {
-        if (\is_string($controller) && false !== strpos($controller, '::')) {
+        if (\is_string($controller) && str_contains($controller, '::')) {
             $controller = explode('::', $controller);
         }
 
@@ -470,7 +470,7 @@ protected function parseController(array|object|string|null $controller)
                 'line' => $r->getStartLine(),
             ];
 
-            if (false !== strpos($r->name, '{closure}')) {
+            if (str_contains($r->name, '{closure}')) {
                 return $controller;
             }
             $controller['method'] = $r->name;
diff --git a/src/Symfony/Component/HttpKernel/DependencyInjection/AddAnnotatedClassesToCachePass.php b/src/Symfony/Component/HttpKernel/DependencyInjection/AddAnnotatedClassesToCachePass.php
index 5eb833b51d074..7dc8b18283804 100644
--- a/src/Symfony/Component/HttpKernel/DependencyInjection/AddAnnotatedClassesToCachePass.php
+++ b/src/Symfony/Component/HttpKernel/DependencyInjection/AddAnnotatedClassesToCachePass.php
@@ -127,7 +127,7 @@ private function patternsToRegexps(array $patterns): array
 
     private function matchAnyRegexps(string $class, array $regexps): bool
     {
-        $isTest = false !== strpos($class, 'Test');
+        $isTest = str_contains($class, 'Test');
 
         foreach ($regexps as $regex) {
             if ($isTest && false === strpos($regex, 'Test')) {
diff --git a/src/Symfony/Component/HttpKernel/Exception/ControllerDoesNotReturnResponseException.php b/src/Symfony/Component/HttpKernel/Exception/ControllerDoesNotReturnResponseException.php
index 1e87690ff1cc8..54c80be90fa50 100644
--- a/src/Symfony/Component/HttpKernel/Exception/ControllerDoesNotReturnResponseException.php
+++ b/src/Symfony/Component/HttpKernel/Exception/ControllerDoesNotReturnResponseException.php
@@ -38,7 +38,7 @@ public function __construct(string $message, callable $controller, string $file,
 
     private function parseControllerDefinition(callable $controller): ?array
     {
-        if (\is_string($controller) && false !== strpos($controller, '::')) {
+        if (\is_string($controller) && str_contains($controller, '::')) {
             $controller = explode('::', $controller);
         }
 
diff --git a/src/Symfony/Component/HttpKernel/HttpCache/AbstractSurrogate.php b/src/Symfony/Component/HttpKernel/HttpCache/AbstractSurrogate.php
index bcfa13446af72..54d0dc9163fba 100644
--- a/src/Symfony/Component/HttpKernel/HttpCache/AbstractSurrogate.php
+++ b/src/Symfony/Component/HttpKernel/HttpCache/AbstractSurrogate.php
@@ -57,7 +57,7 @@ public function hasSurrogateCapability(Request $request)
             return false;
         }
 
-        return false !== strpos($value, sprintf('%s/1.0', strtoupper($this->getName())));
+        return str_contains($value, sprintf('%s/1.0', strtoupper($this->getName())));
     }
 
     /**
diff --git a/src/Symfony/Component/HttpKernel/HttpCache/Esi.php b/src/Symfony/Component/HttpKernel/HttpCache/Esi.php
index 4a1626eca08a9..cd6a00a10d61f 100644
--- a/src/Symfony/Component/HttpKernel/HttpCache/Esi.php
+++ b/src/Symfony/Component/HttpKernel/HttpCache/Esi.php
@@ -37,7 +37,7 @@ public function getName()
      */
     public function addSurrogateControl(Response $response)
     {
-        if (false !== strpos($response->getContent(), '<esi:include')) {
+        if (str_contains($response->getContent(), '<esi:include')) {
             $response->headers->set('Surrogate-Control', 'content="ESI/1.0"');
         }
     }
diff --git a/src/Symfony/Component/HttpKernel/HttpCache/Ssi.php b/src/Symfony/Component/HttpKernel/HttpCache/Ssi.php
index 0ba351dd129c2..f114e05cfb2f6 100644
--- a/src/Symfony/Component/HttpKernel/HttpCache/Ssi.php
+++ b/src/Symfony/Component/HttpKernel/HttpCache/Ssi.php
@@ -34,7 +34,7 @@ public function getName()
      */
     public function addSurrogateControl(Response $response)
     {
-        if (false !== strpos($response->getContent(), '<!--#include')) {
+        if (str_contains($response->getContent(), '<!--#include')) {
             $response->headers->set('Surrogate-Control', 'content="SSI/1.0"');
         }
     }
diff --git a/src/Symfony/Component/HttpKernel/Kernel.php b/src/Symfony/Component/HttpKernel/Kernel.php
index acd12dc0db281..7a58eb22a2d58 100644
--- a/src/Symfony/Component/HttpKernel/Kernel.php
+++ b/src/Symfony/Component/HttpKernel/Kernel.php
@@ -241,13 +241,13 @@ public function locateResource(string $name)
             throw new \InvalidArgumentException(sprintf('A resource name must start with @ ("%s" given).', $name));
         }
 
-        if (false !== strpos($name, '..')) {
+        if (str_contains($name, '..')) {
             throw new \RuntimeException(sprintf('File name "%s" contains invalid characters (..).', $name));
         }
 
         $bundleName = substr($name, 1);
         $path = '';
-        if (false !== strpos($bundleName, '/')) {
+        if (str_contains($bundleName, '/')) {
             [$bundleName, $path] = explode('/', $bundleName, 2);
         }
 
@@ -408,7 +408,7 @@ protected function build(ContainerBuilder $container)
     protected function getContainerClass()
     {
         $class = static::class;
-        $class = false !== strpos($class, "@anonymous\0") ? get_parent_class($class).str_replace('.', '_', ContainerBuilder::hash($class)) : $class;
+        $class = str_contains($class, "@anonymous\0") ? get_parent_class($class).str_replace('.', '_', ContainerBuilder::hash($class)) : $class;
         $class = str_replace('\\', '_', $class).ucfirst($this->environment).($this->debug ? 'Debug' : '').'Container';
 
         if (!preg_match('/^[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*$/', $class)) {
diff --git a/src/Symfony/Component/HttpKernel/Log/Logger.php b/src/Symfony/Component/HttpKernel/Log/Logger.php
index ad719b434b376..410950c1046a3 100644
--- a/src/Symfony/Component/HttpKernel/Log/Logger.php
+++ b/src/Symfony/Component/HttpKernel/Log/Logger.php
@@ -86,7 +86,7 @@ public function log($level, $message, array $context = []): void
 
     private function format(string $level, string $message, array $context, bool $prefixDate = true): string
     {
-        if (false !== strpos($message, '{')) {
+        if (str_contains($message, '{')) {
             $replacements = [];
             foreach ($context as $key => $val) {
                 if (null === $val || is_scalar($val) || $val instanceof \Stringable) {
diff --git a/src/Symfony/Component/HttpKernel/Profiler/FileProfilerStorage.php b/src/Symfony/Component/HttpKernel/Profiler/FileProfilerStorage.php
index 1d95ead92a978..22247c11d70ca 100644
--- a/src/Symfony/Component/HttpKernel/Profiler/FileProfilerStorage.php
+++ b/src/Symfony/Component/HttpKernel/Profiler/FileProfilerStorage.php
@@ -34,7 +34,7 @@ class FileProfilerStorage implements ProfilerStorageInterface
      */
     public function __construct(string $dsn)
     {
-        if (0 !== strpos($dsn, 'file:')) {
+        if (str_contains($dsn, 'file:')) {
             throw new \RuntimeException(sprintf('Please check your configuration. You are trying to use FileStorage with an invalid dsn "%s". The expected format is "file:/path/to/the/storage/folder".', $dsn));
         }
         $this->folder = substr($dsn, 5);
diff --git a/src/Symfony/Component/Intl/Data/Bundle/Writer/TextBundleWriter.php b/src/Symfony/Component/Intl/Data/Bundle/Writer/TextBundleWriter.php
index e8835c4eb8c01..da51d0648ad4a 100644
--- a/src/Symfony/Component/Intl/Data/Bundle/Writer/TextBundleWriter.php
+++ b/src/Symfony/Component/Intl/Data/Bundle/Writer/TextBundleWriter.php
@@ -194,7 +194,7 @@ private function writeTable($file, iterable $value, int $indentation, bool $fall
             fwrite($file, str_repeat('    ', $indentation + 1));
 
             // escape colons, otherwise they are interpreted as resource types
-            if (false !== strpos($key, ':') || false !== strpos($key, ' ')) {
+            if (str_contains($key, ':') || str_contains($key, ' ')) {
                 $key = '"'.$key.'"';
             }
 
diff --git a/src/Symfony/Component/Lock/Store/ZookeeperStore.php b/src/Symfony/Component/Lock/Store/ZookeeperStore.php
index 12c2386ad4160..888c982ada12d 100644
--- a/src/Symfony/Component/Lock/Store/ZookeeperStore.php
+++ b/src/Symfony/Component/Lock/Store/ZookeeperStore.php
@@ -36,7 +36,7 @@ public function __construct(\Zookeeper $zookeeper)
 
     public static function createConnection(string $dsn): \Zookeeper
     {
-        if (0 !== strpos($dsn, 'zookeeper:')) {
+        if (str_contains($dsn, 'zookeeper:')) {
             throw new InvalidArgumentException(sprintf('Unsupported DSN: "%s".', $dsn));
         }
 
@@ -142,7 +142,7 @@ private function getKeyResource(Key $key): string
         // For example: foo/bar will become /foo-bar and /foo/bar will become /-foo-bar
         $resource = (string) $key;
 
-        if (false !== strpos($resource, '/')) {
+        if (str_contains($resource, '/')) {
             $resource = strtr($resource, ['/' => '-']).'-'.sha1($resource);
         }
 
diff --git a/src/Symfony/Component/Mailer/Test/TransportFactoryTestCase.php b/src/Symfony/Component/Mailer/Test/TransportFactoryTestCase.php
index c16835b7e16f3..c2426a0bf27db 100644
--- a/src/Symfony/Component/Mailer/Test/TransportFactoryTestCase.php
+++ b/src/Symfony/Component/Mailer/Test/TransportFactoryTestCase.php
@@ -69,7 +69,7 @@ public function testCreate(Dsn $dsn, TransportInterface $transport)
         $factory = $this->getFactory();
 
         $this->assertEquals($transport, $factory->create($dsn));
-        if (false !== strpos('smtp', $dsn->getScheme())) {
+        if (str_contains('smtp', $dsn->getScheme())) {
             $this->assertStringMatchesFormat($dsn->getScheme().'://%S'.$dsn->getHost().'%S', (string) $transport);
         }
     }
diff --git a/src/Symfony/Component/Mailer/Transport/SendmailTransport.php b/src/Symfony/Component/Mailer/Transport/SendmailTransport.php
index 836da89d76d0e..f9c5009599a62 100644
--- a/src/Symfony/Component/Mailer/Transport/SendmailTransport.php
+++ b/src/Symfony/Component/Mailer/Transport/SendmailTransport.php
@@ -63,7 +63,7 @@ public function __construct(string $command = null, EventDispatcherInterface $di
         }
 
         $this->stream = new ProcessStream();
-        if (false !== strpos($this->command, ' -bs')) {
+        if (str_contains($this->command, ' -bs')) {
             $this->stream->setCommand($this->command);
             $this->transport = new SmtpTransport($this->stream, $dispatcher, $logger);
         }
diff --git a/src/Symfony/Component/Mailer/Transport/Smtp/Stream/AbstractStream.php b/src/Symfony/Component/Mailer/Transport/Smtp/Stream/AbstractStream.php
index 86c1b867c4d0d..a60ef805b58a6 100644
--- a/src/Symfony/Component/Mailer/Transport/Smtp/Stream/AbstractStream.php
+++ b/src/Symfony/Component/Mailer/Transport/Smtp/Stream/AbstractStream.php
@@ -114,7 +114,7 @@ public static function replace(string $from, string $to, iterable $chunks): \Gen
                 continue;
             }
 
-            if (false !== strpos($chunk, $from)) {
+            if (str_contains($chunk, $from)) {
                 $chunk = explode($from, $chunk);
                 $carry = array_pop($chunk);
 
diff --git a/src/Symfony/Component/Messenger/Handler/HandlerDescriptor.php b/src/Symfony/Component/Messenger/Handler/HandlerDescriptor.php
index a0dac29cd0553..0f5bf28e5fc80 100644
--- a/src/Symfony/Component/Messenger/Handler/HandlerDescriptor.php
+++ b/src/Symfony/Component/Messenger/Handler/HandlerDescriptor.php
@@ -65,7 +65,7 @@ private function callableName(callable $handler): string
 
         if ($handler instanceof \Closure) {
             $r = new \ReflectionFunction($handler);
-            if (false !== strpos($r->name, '{closure}')) {
+            if (str_contains($r->name, '{closure}')) {
                 return 'Closure';
             }
             if ($class = $r->getClosureScopeClass()) {
diff --git a/src/Symfony/Component/Messenger/TraceableMessageBus.php b/src/Symfony/Component/Messenger/TraceableMessageBus.php
index ba3aa6fc4209f..a581bac56ebed 100644
--- a/src/Symfony/Component/Messenger/TraceableMessageBus.php
+++ b/src/Symfony/Component/Messenger/TraceableMessageBus.php
@@ -86,7 +86,7 @@ private function getCaller(): array
                 $line = $trace[$i]['line'];
 
                 while (++$i < 8) {
-                    if (isset($trace[$i]['function'], $trace[$i]['file']) && empty($trace[$i]['class']) && 0 !== strpos($trace[$i]['function'], 'call_user_func')) {
+                    if (isset($trace[$i]['function'], $trace[$i]['file']) && empty($trace[$i]['class']) && str_contains($trace[$i]['function'], 'call_user_func')) {
                         $file = $trace[$i]['file'];
                         $line = $trace[$i]['line'];
 
diff --git a/src/Symfony/Component/Messenger/Transport/Serialization/Serializer.php b/src/Symfony/Component/Messenger/Transport/Serialization/Serializer.php
index 378cdd4821dff..210071c67ca47 100644
--- a/src/Symfony/Component/Messenger/Transport/Serialization/Serializer.php
+++ b/src/Symfony/Component/Messenger/Transport/Serialization/Serializer.php
@@ -112,7 +112,7 @@ private function decodeStamps(array $encodedEnvelope): array
     {
         $stamps = [];
         foreach ($encodedEnvelope['headers'] as $name => $value) {
-            if (0 !== strpos($name, self::STAMP_HEADER_PREFIX)) {
+            if (str_contains($name, self::STAMP_HEADER_PREFIX)) {
                 continue;
             }
 
diff --git a/src/Symfony/Component/PasswordHasher/Hasher/MessageDigestPasswordHasher.php b/src/Symfony/Component/PasswordHasher/Hasher/MessageDigestPasswordHasher.php
index f3ac87948d8b8..357a26b3a5463 100644
--- a/src/Symfony/Component/PasswordHasher/Hasher/MessageDigestPasswordHasher.php
+++ b/src/Symfony/Component/PasswordHasher/Hasher/MessageDigestPasswordHasher.php
@@ -71,7 +71,7 @@ public function hash(string $plainPassword, string $salt = null): string
 
     public function verify(string $hashedPassword, string $plainPassword, string $salt = null): bool
     {
-        if (\strlen($hashedPassword) !== $this->hashLength || false !== strpos($hashedPassword, '$')) {
+        if (\strlen($hashedPassword) !== $this->hashLength || str_contains($hashedPassword, '$')) {
             return false;
         }
 
diff --git a/src/Symfony/Component/PasswordHasher/Hasher/NativePasswordHasher.php b/src/Symfony/Component/PasswordHasher/Hasher/NativePasswordHasher.php
index 2fa598b876081..1faaa11dcab60 100644
--- a/src/Symfony/Component/PasswordHasher/Hasher/NativePasswordHasher.php
+++ b/src/Symfony/Component/PasswordHasher/Hasher/NativePasswordHasher.php
@@ -77,7 +77,7 @@ public function hash(string $plainPassword): string
             throw new InvalidPasswordException();
         }
 
-        if (\PASSWORD_BCRYPT === $this->algorithm && (72 < \strlen($plainPassword) || false !== strpos($plainPassword, "\0"))) {
+        if (\PASSWORD_BCRYPT === $this->algorithm && (72 < \strlen($plainPassword) || str_contains($plainPassword, "\0"))) {
             $plainPassword = base64_encode(hash('sha512', $plainPassword, true));
         }
 
@@ -90,9 +90,9 @@ public function verify(string $hashedPassword, string $plainPassword): bool
             return false;
         }
 
-        if (0 !== strpos($hashedPassword, '$argon')) {
+        if (str_contains($hashedPassword, '$argon')) {
             // Bcrypt cuts on NUL chars and after 72 bytes
-            if (0 === strpos($hashedPassword, '$2') && (72 < \strlen($plainPassword) || false !== strpos($plainPassword, "\0"))) {
+            if (0 === strpos($hashedPassword, '$2') && (72 < \strlen($plainPassword) || str_contains($plainPassword, "\0"))) {
                 $plainPassword = base64_encode(hash('sha512', $plainPassword, true));
             }
 
diff --git a/src/Symfony/Component/PasswordHasher/Hasher/Pbkdf2PasswordHasher.php b/src/Symfony/Component/PasswordHasher/Hasher/Pbkdf2PasswordHasher.php
index 5e32de6b0ed43..0553e3de11b22 100644
--- a/src/Symfony/Component/PasswordHasher/Hasher/Pbkdf2PasswordHasher.php
+++ b/src/Symfony/Component/PasswordHasher/Hasher/Pbkdf2PasswordHasher.php
@@ -76,7 +76,7 @@ public function hash(string $plainPassword, string $salt = null): string
 
     public function verify(string $hashedPassword, string $plainPassword, string $salt = null): bool
     {
-        if (\strlen($hashedPassword) !== $this->encodedLength || false !== strpos($hashedPassword, '$')) {
+        if (\strlen($hashedPassword) !== $this->encodedLength || str_contains($hashedPassword, '$')) {
             return false;
         }
 
diff --git a/src/Symfony/Component/PasswordHasher/Hasher/SodiumPasswordHasher.php b/src/Symfony/Component/PasswordHasher/Hasher/SodiumPasswordHasher.php
index d441717d37cac..671d863b143f4 100644
--- a/src/Symfony/Component/PasswordHasher/Hasher/SodiumPasswordHasher.php
+++ b/src/Symfony/Component/PasswordHasher/Hasher/SodiumPasswordHasher.php
@@ -79,8 +79,8 @@ public function verify(string $hashedPassword, string $plainPassword): bool
             return false;
         }
 
-        if (0 !== strpos($hashedPassword, '$argon')) {
-            if (0 === strpos($hashedPassword, '$2') && (72 < \strlen($plainPassword) || false !== strpos($plainPassword, "\0"))) {
+        if (str_contains($hashedPassword, '$argon')) {
+            if (0 === strpos($hashedPassword, '$2') && (72 < \strlen($plainPassword) || str_contains($plainPassword, "\0"))) {
                 $plainPassword = base64_encode(hash('sha512', $plainPassword, true));
             }
 
diff --git a/src/Symfony/Component/Process/Process.php b/src/Symfony/Component/Process/Process.php
index da1514c02c449..98207a0343ed7 100644
--- a/src/Symfony/Component/Process/Process.php
+++ b/src/Symfony/Component/Process/Process.php
@@ -1383,7 +1383,7 @@ protected function isSigchildEnabled()
         ob_start();
         phpinfo(\INFO_GENERAL);
 
-        return self::$sigchild = false !== strpos(ob_get_clean(), '--enable-sigchild');
+        return self::$sigchild = str_contains(ob_get_clean(), '--enable-sigchild');
     }
 
     /**
@@ -1570,7 +1570,7 @@ function ($m) use (&$env, &$varCache, &$varCount, $uid) {
                 if (isset($varCache[$m[0]])) {
                     return $varCache[$m[0]];
                 }
-                if (false !== strpos($value = $m[1], "\0")) {
+                if (str_contains($value = $m[1], "\0")) {
                     $value = str_replace("\0", '?', $value);
                 }
                 if (false === strpbrk($value, "\"%!\n")) {
@@ -1631,7 +1631,7 @@ private function escapeArgument(?string $argument): string
         if ('\\' !== \DIRECTORY_SEPARATOR) {
             return "'".str_replace("'", "'\\''", $argument)."'";
         }
-        if (false !== strpos($argument, "\0")) {
+        if (str_contains($argument, "\0")) {
             $argument = str_replace("\0", '?', $argument);
         }
         if (!preg_match('/[\/()%!^"<>&|\s]/', $argument)) {
diff --git a/src/Symfony/Component/Process/Tests/ProcessTest.php b/src/Symfony/Component/Process/Tests/ProcessTest.php
index 7338e4e463426..e1924b6148bdf 100644
--- a/src/Symfony/Component/Process/Tests/ProcessTest.php
+++ b/src/Symfony/Component/Process/Tests/ProcessTest.php
@@ -39,7 +39,7 @@ public static function setUpBeforeClass(): void
 
         ob_start();
         phpinfo(\INFO_GENERAL);
-        self::$sigchild = false !== strpos(ob_get_clean(), '--enable-sigchild');
+        self::$sigchild = str_contains(ob_get_clean(), '--enable-sigchild');
     }
 
     protected function tearDown(): void
@@ -143,7 +143,7 @@ public function testWaitUntilSpecificOutput()
 
         $completeOutput = '';
         $result = $p->waitUntil(function ($type, $output) use (&$completeOutput) {
-            return false !== strpos($completeOutput .= $output, 'One more');
+            return str_contains($completeOutput .= $output, 'One more');
         });
         $this->assertTrue($result);
         $this->assertLessThan(20, microtime(true) - $start);
diff --git a/src/Symfony/Component/Routing/Matcher/Dumper/CompiledUrlMatcherDumper.php b/src/Symfony/Component/Routing/Matcher/Dumper/CompiledUrlMatcherDumper.php
index 90491b9203868..1dce4cacdc78f 100644
--- a/src/Symfony/Component/Routing/Matcher/Dumper/CompiledUrlMatcherDumper.php
+++ b/src/Symfony/Component/Routing/Matcher/Dumper/CompiledUrlMatcherDumper.php
@@ -349,7 +349,7 @@ private function compileDynamicRoutes(RouteCollection $collection, bool $matchHo
             $state->markTail = 0;
 
             // if the regex is too large, throw a signaling exception to recompute with smaller chunk size
-            set_error_handler(function ($type, $message) { throw false !== strpos($message, $this->signalingException->getMessage()) ? $this->signalingException : new \ErrorException($message); });
+            set_error_handler(function ($type, $message) { throw str_contains($message, $this->signalingException->getMessage()) ? $this->signalingException : new \ErrorException($message); });
             try {
                 preg_match($state->regex, '');
             } finally {
@@ -427,7 +427,7 @@ private function compileRoute(Route $route, string $name, string|array|null $var
 
         if ($condition = $route->getCondition()) {
             $condition = $this->getExpressionLanguage()->compile($condition, ['context', 'request']);
-            $condition = $conditions[$condition] ?? $conditions[$condition] = (false !== strpos($condition, '$request') ? 1 : -1) * \count($conditions);
+            $condition = $conditions[$condition] ?? $conditions[$condition] = (str_contains($condition, '$request') ? 1 : -1) * \count($conditions);
         } else {
             $condition = null;
         }
diff --git a/src/Symfony/Component/Routing/Matcher/Dumper/StaticPrefixCollection.php b/src/Symfony/Component/Routing/Matcher/Dumper/StaticPrefixCollection.php
index c7669b1a91a90..5f0f68e69376d 100644
--- a/src/Symfony/Component/Routing/Matcher/Dumper/StaticPrefixCollection.php
+++ b/src/Symfony/Component/Routing/Matcher/Dumper/StaticPrefixCollection.php
@@ -195,6 +195,6 @@ private function getCommonPrefix(string $prefix, string $anotherPrefix): array
 
     public static function handleError(int $type, string $msg)
     {
-        return false !== strpos($msg, 'Compilation failed: lookbehind assertion is not fixed length');
+        return str_contains($msg, 'Compilation failed: lookbehind assertion is not fixed length');
     }
 }
diff --git a/src/Symfony/Component/Routing/Matcher/TraceableUrlMatcher.php b/src/Symfony/Component/Routing/Matcher/TraceableUrlMatcher.php
index 70a618f76e653..a6d939bf80a6a 100644
--- a/src/Symfony/Component/Routing/Matcher/TraceableUrlMatcher.php
+++ b/src/Symfony/Component/Routing/Matcher/TraceableUrlMatcher.php
@@ -65,7 +65,7 @@ protected function matchCollection(string $pathinfo, RouteCollection $routes)
             $requiredMethods = $route->getMethods();
 
             // check the static prefix of the URL first. Only use the more expensive preg_match when it matches
-            if ('' !== $staticPrefix && 0 !== strpos($trimmedPathinfo, $staticPrefix)) {
+            if ('' !== $staticPrefix && str_contains($trimmedPathinfo, $staticPrefix)) {
                 $this->addTrace(sprintf('Path "%s" does not match', $route->getPath()), self::ROUTE_DOES_NOT_MATCH, $name, $route);
                 continue;
             }
diff --git a/src/Symfony/Component/Routing/Matcher/UrlMatcher.php b/src/Symfony/Component/Routing/Matcher/UrlMatcher.php
index 65afd4f3f44f7..dbcd6ad9adfc7 100644
--- a/src/Symfony/Component/Routing/Matcher/UrlMatcher.php
+++ b/src/Symfony/Component/Routing/Matcher/UrlMatcher.php
@@ -141,7 +141,7 @@ protected function matchCollection(string $pathinfo, RouteCollection $routes)
             $requiredMethods = $route->getMethods();
 
             // check the static prefix of the URL first. Only use the more expensive preg_match when it matches
-            if ('' !== $staticPrefix && 0 !== strpos($trimmedPathinfo, $staticPrefix)) {
+            if ('' !== $staticPrefix && str_contains($trimmedPathinfo, $staticPrefix)) {
                 continue;
             }
             $regex = $compiledRoute->getRegex();
diff --git a/src/Symfony/Component/Routing/RouteCompiler.php b/src/Symfony/Component/Routing/RouteCompiler.php
index da542e1342a2c..938cec479e3cc 100644
--- a/src/Symfony/Component/Routing/RouteCompiler.php
+++ b/src/Symfony/Component/Routing/RouteCompiler.php
@@ -138,7 +138,7 @@ private static function compilePattern(Route $route, string $pattern, bool $isHo
             } else {
                 $precedingChar = substr($precedingText, -1);
             }
-            $isSeparator = '' !== $precedingChar && false !== strpos(static::SEPARATORS, $precedingChar);
+            $isSeparator = '' !== $precedingChar && str_contains(static::SEPARATORS, $precedingChar);
 
             // A PCRE subpattern name must start with a non-digit. Also a PHP variable cannot start with a digit so the
             // variable would not be usable as a Controller action argument.
@@ -283,7 +283,7 @@ private static function findNextSeparator(string $pattern, bool $useUtf8): strin
             preg_match('/^./u', $pattern, $pattern);
         }
 
-        return false !== strpos(static::SEPARATORS, $pattern[0]) ? $pattern[0] : '';
+        return str_contains(static::SEPARATORS, $pattern[0]) ? $pattern[0] : '';
     }
 
     /**
diff --git a/src/Symfony/Component/Security/Core/Authorization/Voter/RoleVoter.php b/src/Symfony/Component/Security/Core/Authorization/Voter/RoleVoter.php
index 3060922b7f081..ce389f7267b67 100644
--- a/src/Symfony/Component/Security/Core/Authorization/Voter/RoleVoter.php
+++ b/src/Symfony/Component/Security/Core/Authorization/Voter/RoleVoter.php
@@ -36,7 +36,7 @@ public function vote(TokenInterface $token, mixed $subject, array $attributes)
         $roles = $this->extractRoles($token);
 
         foreach ($attributes as $attribute) {
-            if (!\is_string($attribute) || 0 !== strpos($attribute, $this->prefix)) {
+            if (!\is_string($attribute) || str_contains($attribute, $this->prefix)) {
                 continue;
             }
 
diff --git a/src/Symfony/Component/Security/Core/Authorization/Voter/Voter.php b/src/Symfony/Component/Security/Core/Authorization/Voter/Voter.php
index 748a4da2fe9c6..eea7181fbc97b 100644
--- a/src/Symfony/Component/Security/Core/Authorization/Voter/Voter.php
+++ b/src/Symfony/Component/Security/Core/Authorization/Voter/Voter.php
@@ -35,7 +35,7 @@ public function vote(TokenInterface $token, mixed $subject, array $attributes)
                     continue;
                 }
             } catch (\TypeError $e) {
-                if (false !== strpos($e->getMessage(), 'supports(): Argument #1')) {
+                if (str_contains($e->getMessage(), 'supports(): Argument #1')) {
                     continue;
                 }
 
diff --git a/src/Symfony/Component/Security/Http/Firewall/ChannelListener.php b/src/Symfony/Component/Security/Http/Firewall/ChannelListener.php
index 9c89d4376d0f9..c6e087fb7febd 100644
--- a/src/Symfony/Component/Security/Http/Firewall/ChannelListener.php
+++ b/src/Symfony/Component/Security/Http/Firewall/ChannelListener.php
@@ -49,7 +49,7 @@ public function supports(Request $request): ?bool
             if (null !== $this->logger) {
                 if ('https' === $request->headers->get('X-Forwarded-Proto')) {
                     $this->logger->info('Redirecting to HTTPS. ("X-Forwarded-Proto" header is set to "https" - did you set "trusted_proxies" correctly?)');
-                } elseif (false !== strpos($request->headers->get('Forwarded'), 'proto=https')) {
+                } elseif (str_contains($request->headers->get('Forwarded'), 'proto=https')) {
                     $this->logger->info('Redirecting to HTTPS. ("Forwarded" header is set to "proto=https" - did you set "trusted_proxies" correctly?)');
                 } else {
                     $this->logger->info('Redirecting to HTTPS.');
diff --git a/src/Symfony/Component/Security/Http/RememberMe/AbstractRememberMeServices.php b/src/Symfony/Component/Security/Http/RememberMe/AbstractRememberMeServices.php
index aa2ab934d13b9..42452f15b5343 100644
--- a/src/Symfony/Component/Security/Http/RememberMe/AbstractRememberMeServices.php
+++ b/src/Symfony/Component/Security/Http/RememberMe/AbstractRememberMeServices.php
@@ -263,7 +263,7 @@ protected function decodeCookie(string $rawCookie)
     protected function encodeCookie(array $cookieParts)
     {
         foreach ($cookieParts as $cookiePart) {
-            if (false !== strpos($cookiePart, self::COOKIE_DELIMITER)) {
+            if (str_contains($cookiePart, self::COOKIE_DELIMITER)) {
                 throw new \InvalidArgumentException(sprintf('$cookieParts should not contain the cookie delimiter "%s".', self::COOKIE_DELIMITER));
             }
         }
diff --git a/src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php b/src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php
index db633e78f076b..27b16bffc42f5 100644
--- a/src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php
+++ b/src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php
@@ -513,7 +513,7 @@ private function validateAndDenormalize(array $types, string $currentClass, stri
             // PHP's json_decode automatically converts Numbers without a decimal part to integers.
             // To circumvent this behavior, integers are converted to floats when denormalizing JSON based formats and when
             // a float is expected.
-            if (Type::BUILTIN_TYPE_FLOAT === $builtinType && \is_int($data) && false !== strpos($format, JsonEncoder::FORMAT)) {
+            if (Type::BUILTIN_TYPE_FLOAT === $builtinType && \is_int($data) && str_contains($format, JsonEncoder::FORMAT)) {
                 return (float) $data;
             }
 
diff --git a/src/Symfony/Component/String/AbstractUnicodeString.php b/src/Symfony/Component/String/AbstractUnicodeString.php
index 73334df3d3bdc..349aa70c091ad 100644
--- a/src/Symfony/Component/String/AbstractUnicodeString.php
+++ b/src/Symfony/Component/String/AbstractUnicodeString.php
@@ -435,7 +435,7 @@ public function width(bool $ignoreAnsiDecoration = true): int
         $width = 0;
         $s = str_replace(["\x00", "\x05", "\x07"], '', $this->string);
 
-        if (false !== strpos($s, "\r")) {
+        if (str_contains($s, "\r")) {
             $s = str_replace(["\r\n", "\r"], "\n", $s);
         }
 
diff --git a/src/Symfony/Component/String/Inflector/EnglishInflector.php b/src/Symfony/Component/String/Inflector/EnglishInflector.php
index 39b8e9a62ad85..f325129fa2fc8 100644
--- a/src/Symfony/Component/String/Inflector/EnglishInflector.php
+++ b/src/Symfony/Component/String/Inflector/EnglishInflector.php
@@ -381,7 +381,7 @@ public function singularize(string $plural): array
                 if ($j === $suffixLength) {
                     // Is there any character preceding the suffix in the plural string?
                     if ($j < $pluralLength) {
-                        $nextIsVocal = false !== strpos('aeiou', $lowerPluralRev[$j]);
+                        $nextIsVocal = str_contains('aeiou', $lowerPluralRev[$j]);
 
                         if (!$map[2] && $nextIsVocal) {
                             // suffix may not succeed a vocal but next char is one
@@ -461,7 +461,7 @@ public function pluralize(string $singular): array
                 if ($j === $suffixLength) {
                     // Is there any character preceding the suffix in the plural string?
                     if ($j < $singularLength) {
-                        $nextIsVocal = false !== strpos('aeiou', $lowerSingularRev[$j]);
+                        $nextIsVocal = str_contains('aeiou', $lowerSingularRev[$j]);
 
                         if (!$map[2] && $nextIsVocal) {
                             // suffix may not succeed a vocal but next char is one
diff --git a/src/Symfony/Component/String/LazyString.php b/src/Symfony/Component/String/LazyString.php
index ba168888906c6..50f3736e9148d 100644
--- a/src/Symfony/Component/String/LazyString.php
+++ b/src/Symfony/Component/String/LazyString.php
@@ -132,7 +132,7 @@ private static function getPrettyName(callable $callback): string
         } elseif ($callback instanceof \Closure) {
             $r = new \ReflectionFunction($callback);
 
-            if (false !== strpos($r->name, '{closure}') || !$class = $r->getClosureScopeClass()) {
+            if (str_contains($r->name, '{closure}') || !$class = $r->getClosureScopeClass()) {
                 return $r->name;
             }
 
diff --git a/src/Symfony/Component/Translation/Extractor/PhpStringTokenParser.php b/src/Symfony/Component/Translation/Extractor/PhpStringTokenParser.php
index e68b0e598c5f4..1d82caf26e597 100644
--- a/src/Symfony/Component/Translation/Extractor/PhpStringTokenParser.php
+++ b/src/Symfony/Component/Translation/Extractor/PhpStringTokenParser.php
@@ -133,7 +133,7 @@ public static function parseDocString(string $startToken, string $str)
         $str = preg_replace('~(\r\n|\n|\r)$~', '', $str);
 
         // nowdoc string
-        if (false !== strpos($startToken, '\'')) {
+        if (str_contains($startToken, '\'')) {
             return $str;
         }
 
diff --git a/src/Symfony/Component/Translation/Loader/MoFileLoader.php b/src/Symfony/Component/Translation/Loader/MoFileLoader.php
index 654331a2b136c..0ff6549d5292b 100644
--- a/src/Symfony/Component/Translation/Loader/MoFileLoader.php
+++ b/src/Symfony/Component/Translation/Loader/MoFileLoader.php
@@ -89,7 +89,7 @@ protected function loadResource(string $resource)
             fseek($stream, $offset);
             $singularId = fread($stream, $length);
 
-            if (false !== strpos($singularId, "\000")) {
+            if (str_contains($singularId, "\000")) {
                 [$singularId, $pluralId] = explode("\000", $singularId);
             }
 
@@ -104,7 +104,7 @@ protected function loadResource(string $resource)
             fseek($stream, $offset);
             $translated = fread($stream, $length);
 
-            if (false !== strpos($translated, "\000")) {
+            if (str_contains($translated, "\000")) {
                 $translated = explode("\000", $translated);
             }
 
diff --git a/src/Symfony/Component/Translation/MessageCatalogue.php b/src/Symfony/Component/Translation/MessageCatalogue.php
index 9339c07aae7d9..c30d9a56dabb0 100644
--- a/src/Symfony/Component/Translation/MessageCatalogue.php
+++ b/src/Symfony/Component/Translation/MessageCatalogue.php
@@ -68,7 +68,7 @@ public function all(string $domain = null)
     {
         if (null !== $domain) {
             // skip messages merge if intl-icu requested explicitly
-            if (false !== strpos($domain, self::INTL_DOMAIN_SUFFIX)) {
+            if (str_contains($domain, self::INTL_DOMAIN_SUFFIX)) {
                 return $this->messages[$domain] ?? [];
             }
 
diff --git a/src/Symfony/Component/Validator/Constraints/HostnameValidator.php b/src/Symfony/Component/Validator/Constraints/HostnameValidator.php
index f435fdc0c2e89..2371e00cccbcb 100644
--- a/src/Symfony/Component/Validator/Constraints/HostnameValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/HostnameValidator.php
@@ -64,6 +64,6 @@ private function isValid(string $domain): bool
 
     private function hasValidTld(string $domain): bool
     {
-        return false !== strpos($domain, '.') && !\in_array(substr($domain, strrpos($domain, '.') + 1), self::RESERVED_TLDS, true);
+        return str_contains($domain, '.') && !\in_array(substr($domain, strrpos($domain, '.') + 1), self::RESERVED_TLDS, true);
     }
 }
diff --git a/src/Symfony/Component/Validator/Constraints/Regex.php b/src/Symfony/Component/Validator/Constraints/Regex.php
index 0db486a0d9852..e411209c56a4f 100644
--- a/src/Symfony/Component/Validator/Constraints/Regex.php
+++ b/src/Symfony/Component/Validator/Constraints/Regex.php
@@ -115,7 +115,7 @@ public function getHtmlPattern()
 
         // If the pattern contains an or statement, wrap the pattern in
         // .*(pattern).* and quit. Otherwise we'd need to parse the pattern
-        if (false !== strpos($pattern, '|')) {
+        if (str_contains($pattern, '|')) {
             return '.*('.$pattern.').*';
         }
 
diff --git a/src/Symfony/Component/Validator/Mapping/Factory/LazyLoadingMetadataFactory.php b/src/Symfony/Component/Validator/Mapping/Factory/LazyLoadingMetadataFactory.php
index aff127379efc2..229462c9eccb3 100644
--- a/src/Symfony/Component/Validator/Mapping/Factory/LazyLoadingMetadataFactory.php
+++ b/src/Symfony/Component/Validator/Mapping/Factory/LazyLoadingMetadataFactory.php
@@ -155,7 +155,7 @@ public function hasMetadataFor(mixed $value)
      */
     private function escapeClassName(string $class): string
     {
-        if (false !== strpos($class, '@')) {
+        if (str_contains($class, '@')) {
             // anonymous class: replace all PSR6-reserved characters
             return str_replace(["\0", '\\', '/', '@', ':', '{', '}', '(', ')'], '.', $class);
         }
diff --git a/src/Symfony/Component/Validator/Mapping/Loader/AbstractLoader.php b/src/Symfony/Component/Validator/Mapping/Loader/AbstractLoader.php
index 951a44122c527..4ca03f8731d6b 100644
--- a/src/Symfony/Component/Validator/Mapping/Loader/AbstractLoader.php
+++ b/src/Symfony/Component/Validator/Mapping/Loader/AbstractLoader.php
@@ -66,9 +66,9 @@ protected function addNamespaceAlias(string $alias, string $namespace)
      */
     protected function newConstraint(string $name, mixed $options = null)
     {
-        if (false !== strpos($name, '\\') && class_exists($name)) {
+        if (str_contains($name, '\\') && class_exists($name)) {
             $className = (string) $name;
-        } elseif (false !== strpos($name, ':')) {
+        } elseif (str_contains($name, ':')) {
             [$prefix, $className] = explode(':', $name, 2);
 
             if (!isset($this->namespaces[$prefix])) {
diff --git a/src/Symfony/Component/Validator/Validator/TraceableValidator.php b/src/Symfony/Component/Validator/Validator/TraceableValidator.php
index 07658691e9c4a..988b88d5142fe 100644
--- a/src/Symfony/Component/Validator/Validator/TraceableValidator.php
+++ b/src/Symfony/Component/Validator/Validator/TraceableValidator.php
@@ -81,7 +81,7 @@ public function validate(mixed $value, Constraint|array $constraints = null, str
                 $line = $trace[$i]['line'];
 
                 while (++$i < 7) {
-                    if (isset($trace[$i]['function'], $trace[$i]['file']) && empty($trace[$i]['class']) && 0 !== strpos($trace[$i]['function'], 'call_user_func')) {
+                    if (isset($trace[$i]['function'], $trace[$i]['file']) && empty($trace[$i]['class']) && str_contains($trace[$i]['function'], 'call_user_func')) {
                         $file = $trace[$i]['file'];
                         $line = $trace[$i]['line'];
 
diff --git a/src/Symfony/Component/VarDumper/Caster/ClassStub.php b/src/Symfony/Component/VarDumper/Caster/ClassStub.php
index 0431fa6baa5c3..ba10c13093f7d 100644
--- a/src/Symfony/Component/VarDumper/Caster/ClassStub.php
+++ b/src/Symfony/Component/VarDumper/Caster/ClassStub.php
@@ -55,7 +55,7 @@ public function __construct(string $identifier, callable|array|string $callable
                 }
             }
 
-            if (false !== strpos($identifier, "@anonymous\0")) {
+            if (str_contains($identifier, "@anonymous\0")) {
                 $this->value = $identifier = preg_replace_callback('/[a-zA-Z_\x7f-\xff][\\\\a-zA-Z0-9_\x7f-\xff]*+@anonymous\x00.*?\.php(?:0x?|:[0-9]++\$)[0-9a-fA-F]++/', function ($m) {
                     return class_exists($m[0], false) ? (get_parent_class($m[0]) ?: key(class_implements($m[0])) ?: 'class').'@anonymous' : $m[0];
                 }, $identifier);
diff --git a/src/Symfony/Component/VarDumper/Caster/ExceptionCaster.php b/src/Symfony/Component/VarDumper/Caster/ExceptionCaster.php
index 437db26d299d5..85a47f808ef72 100644
--- a/src/Symfony/Component/VarDumper/Caster/ExceptionCaster.php
+++ b/src/Symfony/Component/VarDumper/Caster/ExceptionCaster.php
@@ -281,7 +281,7 @@ private static function filterExceptionArray(string $xClass, array $a, string $x
         }
         unset($a[$xPrefix.'string'], $a[Caster::PREFIX_DYNAMIC.'xdebug_message'], $a[Caster::PREFIX_DYNAMIC.'__destructorException']);
 
-        if (isset($a[Caster::PREFIX_PROTECTED.'message']) && false !== strpos($a[Caster::PREFIX_PROTECTED.'message'], "@anonymous\0")) {
+        if (isset($a[Caster::PREFIX_PROTECTED.'message']) && str_contains($a[Caster::PREFIX_PROTECTED.'message'], "@anonymous\0")) {
             $a[Caster::PREFIX_PROTECTED.'message'] = preg_replace_callback('/[a-zA-Z_\x7f-\xff][\\\\a-zA-Z0-9_\x7f-\xff]*+@anonymous\x00.*?\.php(?:0x?|:[0-9]++\$)[0-9a-fA-F]++/', function ($m) {
                 return class_exists($m[0], false) ? (get_parent_class($m[0]) ?: key(class_implements($m[0])) ?: 'class').'@anonymous' : $m[0];
             }, $a[Caster::PREFIX_PROTECTED.'message']);
diff --git a/src/Symfony/Component/VarDumper/Caster/LinkStub.php b/src/Symfony/Component/VarDumper/Caster/LinkStub.php
index e937cdc3efdc4..1ce96d1b36f60 100644
--- a/src/Symfony/Component/VarDumper/Caster/LinkStub.php
+++ b/src/Symfony/Component/VarDumper/Caster/LinkStub.php
@@ -38,7 +38,7 @@ public function __construct(string $label, int $line = 0, string $href = null)
                 $label = substr($label, 7);
             }
             $href = substr($href, 7);
-        } elseif (false !== strpos($href, '://')) {
+        } elseif (str_contains($href, '://')) {
             $this->attr['href'] = $href;
 
             return;
diff --git a/src/Symfony/Component/VarDumper/Cloner/AbstractCloner.php b/src/Symfony/Component/VarDumper/Cloner/AbstractCloner.php
index cdf886ac632b3..8e9dc975814cf 100644
--- a/src/Symfony/Component/VarDumper/Cloner/AbstractCloner.php
+++ b/src/Symfony/Component/VarDumper/Cloner/AbstractCloner.php
@@ -309,7 +309,7 @@ protected function castObject(Stub $stub, bool $isNested)
         $obj = $stub->value;
         $class = $stub->class;
 
-        if (false !== strpos($class, "@anonymous\0")) {
+        if (str_contains($class, "@anonymous\0")) {
             $stub->class = get_debug_type($obj);
         }
         if (isset($this->classInfo[$class])) {
diff --git a/src/Symfony/Component/VarDumper/Dumper/CliDumper.php b/src/Symfony/Component/VarDumper/Dumper/CliDumper.php
index cc4fd86e0f48b..8a9ce2cb71b28 100644
--- a/src/Symfony/Component/VarDumper/Dumper/CliDumper.php
+++ b/src/Symfony/Component/VarDumper/Dumper/CliDumper.php
@@ -204,7 +204,7 @@ public function dumpString(Cursor $cursor, string $str, bool $bin, int $cut)
                 'length' => 0 <= $cut ? mb_strlen($str, 'UTF-8') + $cut : 0,
                 'binary' => $bin,
             ];
-            $str = $bin && false !== strpos($str, "\0") ? [$str] : explode("\n", $str);
+            $str = $bin && str_contains($str, "\0") ? [$str] : explode("\n", $str);
             if (isset($str[1]) && !isset($str[2]) && !isset($str[1][0])) {
                 unset($str[1]);
                 $str[0] .= "\n";
diff --git a/src/Symfony/Component/VarDumper/Dumper/ContextProvider/SourceContextProvider.php b/src/Symfony/Component/VarDumper/Dumper/ContextProvider/SourceContextProvider.php
index c3cd3221a8007..7297a4ffba97e 100644
--- a/src/Symfony/Component/VarDumper/Dumper/ContextProvider/SourceContextProvider.php
+++ b/src/Symfony/Component/VarDumper/Dumper/ContextProvider/SourceContextProvider.php
@@ -56,7 +56,7 @@ public function getContext(): ?array
                 $line = $trace[$i]['line'] ?? $line;
 
                 while (++$i < $this->limit) {
-                    if (isset($trace[$i]['function'], $trace[$i]['file']) && empty($trace[$i]['class']) && 0 !== strpos($trace[$i]['function'], 'call_user_func')) {
+                    if (isset($trace[$i]['function'], $trace[$i]['file']) && empty($trace[$i]['class']) && str_contains($trace[$i]['function'], 'call_user_func')) {
                         $file = $trace[$i]['file'];
                         $line = $trace[$i]['line'];
 
diff --git a/src/Symfony/Component/WebLink/Link.php b/src/Symfony/Component/WebLink/Link.php
index 0b68a8e30b6dd..b7785992fdb18 100644
--- a/src/Symfony/Component/WebLink/Link.php
+++ b/src/Symfony/Component/WebLink/Link.php
@@ -157,6 +157,6 @@ public function withoutAttribute(string $attribute)
 
     private function hrefIsTemplated(string $href): bool
     {
-        return false !== strpos($href, '{') || false !== strpos($href, '}');
+        return str_contains($href, '{') || str_contains($href, '}');
     }
 }
diff --git a/src/Symfony/Component/Yaml/Command/LintCommand.php b/src/Symfony/Component/Yaml/Command/LintCommand.php
index 32eab0c61b127..4f7a2a305ad31 100644
--- a/src/Symfony/Component/Yaml/Command/LintCommand.php
+++ b/src/Symfony/Component/Yaml/Command/LintCommand.php
@@ -174,7 +174,7 @@ private function displayTxt(SymfonyStyle $io, array $filesInfo, bool $errorAsGit
                 $io->text('<error> ERROR </error>'.($info['file'] ? sprintf(' in %s', $info['file']) : ''));
                 $io->text(sprintf('<error> >> %s</error>', $info['message']));
 
-                if (false !== strpos($info['message'], 'PARSE_CUSTOM_TAGS')) {
+                if (str_contains($info['message'], 'PARSE_CUSTOM_TAGS')) {
                     $suggestTagOption = true;
                 }
 
@@ -203,7 +203,7 @@ private function displayJson(SymfonyStyle $io, array $filesInfo): int
                 ++$errors;
             }
 
-            if (isset($v['message']) && false !== strpos($v['message'], 'PARSE_CUSTOM_TAGS')) {
+            if (isset($v['message']) && str_contains($v['message'], 'PARSE_CUSTOM_TAGS')) {
                 $v['message'] .= ' Use the --parse-tags option if you want parse custom tags.';
             }
         });
diff --git a/src/Symfony/Component/Yaml/Dumper.php b/src/Symfony/Component/Yaml/Dumper.php
index 2cbae238cc059..a61fb2822465b 100644
--- a/src/Symfony/Component/Yaml/Dumper.php
+++ b/src/Symfony/Component/Yaml/Dumper.php
@@ -68,7 +68,7 @@ public function dump(mixed $input, int $inline = 0, int $indent = 0, int $flags
                     $output .= "\n";
                 }
 
-                if (Yaml::DUMP_MULTI_LINE_LITERAL_BLOCK & $flags && \is_string($value) && false !== strpos($value, "\n") && false === strpos($value, "\r")) {
+                if (Yaml::DUMP_MULTI_LINE_LITERAL_BLOCK & $flags && \is_string($value) && str_contains($value, "\n") && false === strpos($value, "\r")) {
                     // If the first line starts with a space character, the spec requires a blockIndicationIndicator
                     // http://www.yaml.org/spec/1.2/spec.html#id2793979
                     $blockIndentationIndicator = (' ' === substr($value, 0, 1)) ? (string) $this->indentation : '';
@@ -97,7 +97,7 @@ public function dump(mixed $input, int $inline = 0, int $indent = 0, int $flags
                 if ($value instanceof TaggedValue) {
                     $output .= sprintf('%s%s !%s', $prefix, $dumpAsMap ? Inline::dump($key, $flags).':' : '-', $value->getTag());
 
-                    if (Yaml::DUMP_MULTI_LINE_LITERAL_BLOCK & $flags && \is_string($value->getValue()) && false !== strpos($value->getValue(), "\n") && false === strpos($value->getValue(), "\r\n")) {
+                    if (Yaml::DUMP_MULTI_LINE_LITERAL_BLOCK & $flags && \is_string($value->getValue()) && str_contains($value->getValue(), "\n") && false === strpos($value->getValue(), "\r\n")) {
                         // If the first line starts with a space character, the spec requires a blockIndicationIndicator
                         // http://www.yaml.org/spec/1.2/spec.html#id2793979
                         $blockIndentationIndicator = (' ' === substr($value->getValue(), 0, 1)) ? (string) $this->indentation : '';
diff --git a/src/Symfony/Component/Yaml/Inline.php b/src/Symfony/Component/Yaml/Inline.php
index 44a398046df04..822cecc6186a0 100644
--- a/src/Symfony/Component/Yaml/Inline.php
+++ b/src/Symfony/Component/Yaml/Inline.php
@@ -342,7 +342,7 @@ private static function parseSequence(string $sequence, int $flags, int &$i = 0,
                     $value = self::parseScalar($sequence, $flags, [',', ']'], $i, null === $tag, $references);
 
                     // the value can be an array if a reference has been resolved to an array var
-                    if (\is_string($value) && !$isQuoted && false !== strpos($value, ': ')) {
+                    if (\is_string($value) && !$isQuoted && str_contains($value, ': ')) {
                         // embedded mapping?
                         try {
                             $pos = 0;
diff --git a/src/Symfony/Component/Yaml/Parser.php b/src/Symfony/Component/Yaml/Parser.php
index fb9315b5e34fe..5e3b48735497f 100644
--- a/src/Symfony/Component/Yaml/Parser.php
+++ b/src/Symfony/Component/Yaml/Parser.php
@@ -443,7 +443,7 @@ private function doParse(string $value, int $flags)
                             throw new ParseException('Unable to parse.', $this->getRealCurrentLineNb() + 1, $this->currentLine, $this->filename);
                         }
 
-                        if (false !== strpos($line, ': ')) {
+                        if (str_contains($line, ': ')) {
                             throw new ParseException('Mapping values are not allowed in multi-line blocks.', $this->getRealCurrentLineNb() + 1, $this->currentLine, $this->filename);
                         }
 
@@ -786,7 +786,7 @@ private function parseValue(string $value, int $flags, string $context): mixed
 
                     $parsedValue = Inline::parse($value, $flags, $this->refs);
 
-                    if ('mapping' === $context && \is_string($parsedValue) && '"' !== $value[0] && "'" !== $value[0] && '[' !== $value[0] && '{' !== $value[0] && '!' !== $value[0] && false !== strpos($parsedValue, ': ')) {
+                    if ('mapping' === $context && \is_string($parsedValue) && '"' !== $value[0] && "'" !== $value[0] && '[' !== $value[0] && '{' !== $value[0] && '!' !== $value[0] && str_contains($parsedValue, ': ')) {
                         throw new ParseException('A colon cannot be used in an unquoted mapping value.', $this->getRealCurrentLineNb() + 1, $value, $this->filename);
                     }
 
diff --git a/src/Symfony/Contracts/HttpClient/Test/Fixtures/web/index.php b/src/Symfony/Contracts/HttpClient/Test/Fixtures/web/index.php
index 30a7049758d0d..c51ac149e4a06 100644
--- a/src/Symfony/Contracts/HttpClient/Test/Fixtures/web/index.php
+++ b/src/Symfony/Contracts/HttpClient/Test/Fixtures/web/index.php
@@ -15,7 +15,7 @@
 foreach ($_SERVER as $k => $v) {
     switch ($k) {
         default:
-            if (0 !== strpos($k, 'HTTP_')) {
+            if (str_contains($k, 'HTTP_')) {
                 continue 2;
             }
             // no break