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<?php class Singleton { private static $instance = null; final private function __construct() {} final private function __clone() {} public static function getInstance() { if (!self::$instance) { self::$instance = new self; } return self::$instance; } } $oneInstance = Singleton::getInstance(); echo "Cloneable outside:", var_dump((new ReflectionClass('Singleton'))->isCloneable()); $cloner = function () { return clone $this; }; $secondInstance = $cloner->bindTo($oneInstance, 'Singleton')->__invoke(); var_dump($oneInstance, $secondInstance);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Private methods cannot be final as they are never overridden by other classes in /in/v8SIO on line 8 Cloneable outside:bool(false) object(Singleton)#1 (0) { } object(Singleton)#4 (0) { }

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