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run code in 150+ php & hhvm versions
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<?php class Singleton { private function __construct(){} private function __clone(){} private function __sleep(){} private function __wakeup(){} private static $instance; public static function getInstance() { if ( ! self::$instance) { self::$instance = new static(); } return self::$instance; } } $obj1 = Singleton::getInstance(); $obj2 = Singleton::getInstance(); var_dump(spl_object_hash($obj1) == spl_object_hash($obj2)); $cloner = function(){ return function(){ var_dump($this); return clone $this; }; }; $obj3 = null; $obj3 = $cloner->bindTo($obj1, 'Singleton')->__invoke(); var_dump($obj1, $obj3);
Output for 5.4.0 - 5.6.28, 7.0.0 - 7.1.0
bool(true) object(Singleton)#1 (0) { } object(Closure)#4 (1) { ["this"]=> object(Singleton)#1 (0) { } }
Output for hhvm-3.12.0
bool(true) object(Singleton)#1 (0) { } object(Closure$getInstance;1707690722)#4 (1) { ["this"]=> object(Singleton)#1 (0) { } }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.0 - 5.3.29
bool(true) Fatal error: Call to undefined method Closure::bindTo() in /in/abSIe on line 41
Process exited with code 255.
Output for 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_STATIC, expecting T_STRING or T_VARIABLE or '$' in /in/abSIe on line 17
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_STATIC, expecting T_STRING or T_VARIABLE or '$' in /in/abSIe on line 17
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/abSIe 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/abSIe 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/abSIe on line 5
Process exited with code 255.