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<?php class Singleton { private static $instance = null; final private function __construct() {} final private function __clone() {} final private function __invoke() {} public static function getInstance() { if (!self::$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 5.5.0 - 5.6.28, 7.0.0 - 7.1.0
Warning: The magic method __invoke() must have public visibility and cannot be static in /in/SEmvI on line 9 Cloneable outside:bool(false) object(Singleton)#1 (0) { } object(Singleton)#4 (0) { }
Output for 5.4.0 - 5.4.45, hhvm-3.10.0 - 3.12.0
Cloneable outside:bool(false) object(Singleton)#1 (0) { } object(Singleton)#4 (0) { }
Output for 5.1.0 - 5.3.29
Parse error: syntax error, unexpected T_OBJECT_OPERATOR in /in/SEmvI on line 21
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_OBJECT_OPERATOR in /in/SEmvI on line 21
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/SEmvI on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/SEmvI on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/SEmvI on line 5
Process exited with code 255.