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Commit 702fb4d

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nicolas-grekasnicolas-grekas
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[VarExporter] add Instantiator::instantiate() to create+populate objects without calling their constructor nor any other methods
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‎src/Symfony/Component/VarExporter/Instantiator.php

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<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\VarExporter;
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use Symfony\Component\VarExporter\Internal\Hydrator;
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use Symfony\Component\VarExporter\Internal\Registry;
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/**
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* A utility class to create objects without calling their constructor.
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*
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* @author Nicolas Grekas <p@tchwork.com>
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*/
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final class Instantiator
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{
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/**
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* Creates an object and sets its properties without calling its constructor nor any other methods.
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*
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* For example:
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*
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* // creates an empty instance of Foo
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* Instantiator::instantiate([Foo::class => []]);
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*
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* // creates a Foo instance and sets one of its public, protected or private properties
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* Instantiator::instantiate([Foo::class => ['propertyName' => $propertyValue]]);
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*
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* // creates a Foo instance and sets a private property defined on its parent Bar class
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* Instantiator::instantiate([
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* Foo::class => [],
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* Bar::class => ['privatePropertyName' => $propertyValue],
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* ]);
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*
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* Instances of ArrayObject, ArrayIterator and SplObjectHash can be created
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* by using the special "\0" property name to define their internal value:
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*
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* // creates an SplObjectHash where $info1 is attached to $obj1, etc.
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* Instantiator::instantiate([SplObjectStorage::class => ["\0" => [$obj1, $info1, $obj2, $info2...]]]);
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*
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* // creates an ArrayObject populated with $inputArray
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* Instantiator::instantiate([ArrayObject::class => ["\0" => $inputArray]]);
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*
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* @param array $propertiesByClass The properties to set on the object, keyed by the class to bind to
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* when setting them. The first key of the array defines the class
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* of the returned instance.
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*
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* @return object An instance of the class defined by the first key of $propertiesByClass
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*
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* @throws \ReflectionException When the instance cannot be created
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*/
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public static function instantiate(array $propertiesByClass)
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{
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if (!$propertiesByClass) {
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throw new \ReflectionException('No class provided.');
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}
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foreach ($propertiesByClass as $class => $properties) {
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break;
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}
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try {
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$reflector = Registry::$reflectors[$class] ?? Registry::getClassReflector($class);
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} catch (\Exception $e) {
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if (0 === strpos($e->getMessage(), 'Serialization of ')) {
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$e = new \ReflectionException(substr_replace($e->getMessage(), 'Instanti', 0, 8));
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}
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throw $e;
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}
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if (Registry::$cloneable[$class]) {
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$instance = clone Registry::$prototypes[$class];
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} elseif (Registry::$instantiableWithoutConstructor[$class]) {
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$instance = $reflector->newInstanceWithoutConstructor();
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} elseif (null === Registry::$prototypes[$class]) {
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throw new \ReflectionException(sprintf("Instantiation of '%s' is not allowed", $class));
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} elseif ($reflector->implementsInterface('Serializable')) {
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$instance = unserialize('C:'.\strlen($class).':"'.$class.'":0:{}');
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} else {
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$instance = unserialize('O:'.\strlen($class).':"'.$class.'":0:{}');
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}
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$instance = array($instance);
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foreach ($propertiesByClass as $class => $properties) {
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if (!$properties) {
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continue;
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}
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foreach ($properties as $name => $value) {
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$properties[$name] = array($value);
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}
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(Hydrator::$hydrators[$class] ?? Hydrator::getHydrator($class))($properties, $instance);
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}
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return $instance[0];
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}
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}

‎src/Symfony/Component/VarExporter/Internal/Hydrator.php

Copy file name to clipboardExpand all lines: src/Symfony/Component/VarExporter/Internal/Hydrator.php
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@@ -78,7 +78,7 @@ public static function getHydrator($class)
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}
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}
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}
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foreach ($properties["\0"] as $i => $v) {
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foreach ($properties["\0"] ?? array() as $i => $v) {
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$constructor->invokeArgs($objects[$i], $v);
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}
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};

‎src/Symfony/Component/VarExporter/README.md

Copy file name to clipboardExpand all lines: src/Symfony/Component/VarExporter/README.md
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@@ -5,6 +5,9 @@ The VarExporter component allows exporting any serializable PHP data structure t
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plain PHP code. While doing so, it preserves all the semantics associated with
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the serialization mechanism of PHP (`__wakeup`, `__sleep`, `Serializable`).
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It also provides an instantiator that allows creating and populating objects
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without calling their constructor nor any other methods.
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The reason to use this component *vs* `serialize()` or
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[igbinary](https://github.com/igbinary/igbinary) is performance: thanks to
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OPcache, the resulting code is significantly faster and more memory efficient

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