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<?php /** * Provides dependency injection friendly methods for serialization. */ trait DependencySerializationTrait { /** * An array of service IDs keyed by property name used for serialization. * * @var array */ // phpcs:ignore Drupal.Classes.PropertyDeclaration protected $_serviceIds = []; /** * An array of entity type IDs keyed by the property name of their storages. * * @var array */ // phpcs:ignore Drupal.Classes.PropertyDeclaration protected $_entityStorages = []; /** * {@inheritdoc} */ public function __sleep() { $closure = \Closure::bind(static function ($class) { return get_object_vars($class); }, NULL, $this); $vars = $closure($this); return array_keys($vars); } /** * {@inheritdoc} */ #[\ReturnTypeWillChange] public function __wakeup() { } } class A { use DependencySerializationTrait; private int $a = 1; public function doIt() { print "get_object_vars()\n"; print_r(get_object_vars($this)); $closure = \Closure::bind(static function ($class) { return get_object_vars($class); }, NULL, $this); $vars = $closure($this); print "\n\nClosure\n"; print_r($vars); } protected function foo() { return $this->a; } } class B extends A { private int $a = 42; private int $b = 2; public function bar() { return $this->foo(); } public function baz() { return $this->a; } } $b = new B(); $b->doit(); echo PHP_EOL; echo "Before serialize:" . PHP_EOL; echo $b->bar() . PHP_EOL; echo $b->baz() . PHP_EOL; $c = unserialize(serialize($b)); echo "After serialize:" . PHP_EOL; echo $c->bar() . PHP_EOL; echo $b->baz() . PHP_EOL;