symfony
diff --git a/‎composer.json
Copy file name to clipboardExpand all lines: composer.json
+2-1Lines changed: 2 additions & 1 deletion b/‎composer.json
Copy file name to clipboardExpand all lines: composer.json
+2-1Lines changed: 2 additions & 1 deletion
diff --git a/‎src/Symfony/Component/Validator/Constraints/LengthValidator.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Validator/Constraints/LengthValidator.php
+10-2Lines changed: 10 additions & 2 deletions b/‎src/Symfony/Component/Validator/Constraints/LengthValidator.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Validator/Constraints/LengthValidator.php
+10-2Lines changed: 10 additions & 2 deletions
diff --git a/‎src/Symfony/Component/Validator/composer.json
Copy file name to clipboardExpand all lines: src/Symfony/Component/Validator/composer.json
+1Lines changed: 1 addition & 0 deletions b/‎src/Symfony/Component/Validator/composer.json
Copy file name to clipboardExpand all lines: src/Symfony/Component/Validator/composer.json
+1Lines changed: 1 addition & 0 deletions
@@ -31,7 +31,8 @@
         "symfony/polyfill-intl-icu": "~1.0",
         "symfony/polyfill-mbstring": "~1.0",
         "symfony/polyfill-php56": "~1.0",
-        "symfony/polyfill-php70": "~1.6"
+        "symfony/polyfill-php70": "~1.6",
+        "symfony/polyfill-php80": "~1.17"
     },
     "replace": {
         "symfony/asset": "self.version",
 
@@ -39,8 +39,14 @@ public function validate($value, Constraint $constraint)
 
         $stringValue = (string) $value;
 
-        if (!$invalidCharset = !@mb_check_encoding($stringValue, $constraint->charset)) {
-            $length = mb_strlen($stringValue, $constraint->charset);
+        try {
+            $invalidCharset = !@mb_check_encoding($stringValue, $constraint->charset);
+        } catch (\ValueError $e) {
+            if (!str_starts_with($e->getMessage(), 'mb_check_encoding(): Argument #2 ($encoding) must be a valid encoding')) {
+                throw $e;
+            }
+
+            $invalidCharset = true;
         }
 
         if ($invalidCharset) {
@@ -54,6 +60,8 @@ public function validate($value, Constraint $constraint)
             return;
         }
 
+        $length = mb_strlen($stringValue, $constraint->charset);
+
         if (null !== $constraint->max && $length > $constraint->max) {
             $this->context->buildViolation($constraint->min == $constraint->max ? $constraint->exactMessage : $constraint->maxMessage)
                 ->setParameter('{{ value }}', $this->formatValue($stringValue))
 
@@ -19,6 +19,7 @@
         "php": "^5.5.9|>=7.0.8",
         "symfony/polyfill-ctype": "~1.8",
         "symfony/polyfill-mbstring": "~1.0",
+        "symfony/polyfill-php80": "~1.17",
         "symfony/translation": "~2.8|~3.0|~4.0"
     },
     "require-dev": {