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<?php final class Subject { private function __construct() {} public static function getFactory() { return new Factory(function() { new Subject(); }); } } final class Factory { private $callback; public function __construct(callable $callback) { $this->callback = $callback; } public function getProduct() { return call_user_func($callback); } } $factory = Subject::getFactory(); $subject = $factory->getProduct();
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $callback in /in/9qQlD on line 26 Fatal error: Uncaught TypeError: call_user_func(): Argument #1 ($callback) must be a valid callback, no array or string given in /in/9qQlD:26 Stack trace: #0 /in/9qQlD(31): Factory->getProduct() #1 {main} thrown in /in/9qQlD on line 26
Process exited with code 255.

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