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<?php class Singleton { private static $instance = null; final private function __construct() {} final private function __clone() {} public function __wakeup() { throw new Exception("Cannot unserialize singleton"); } public static function getInstance() { if (!self::$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(); // $thirdInstance = clone $oneInstance; var_dump($secondInstance); var_dump((new ReflectionClass($secondInstance))->getMethods());
Output for 7.1.0
Cloneable outside:bool(false) object(Closure)#3 (1) { ["this"]=> object(Singleton)#1 (0) { } } array(5) { [0]=> object(ReflectionMethod)#5 (2) { ["name"]=> string(11) "__construct" ["class"]=> string(7) "Closure" } [1]=> object(ReflectionMethod)#6 (2) { ["name"]=> string(4) "bind" ["class"]=> string(7) "Closure" } [2]=> object(ReflectionMethod)#7 (2) { ["name"]=> string(6) "bindTo" ["class"]=> string(7) "Closure" } [3]=> object(ReflectionMethod)#8 (2) { ["name"]=> string(4) "call" ["class"]=> string(7) "Closure" } [4]=> object(ReflectionMethod)#9 (2) { ["name"]=> string(12) "fromCallable" ["class"]=> string(7) "Closure" } }
Output for 7.0.0 - 7.0.14
Cloneable outside:bool(false) object(Closure)#3 (1) { ["this"]=> object(Singleton)#1 (0) { } } array(4) { [0]=> object(ReflectionMethod)#5 (2) { ["name"]=> string(11) "__construct" ["class"]=> string(7) "Closure" } [1]=> object(ReflectionMethod)#6 (2) { ["name"]=> string(4) "bind" ["class"]=> string(7) "Closure" } [2]=> object(ReflectionMethod)#7 (2) { ["name"]=> string(6) "bindTo" ["class"]=> string(7) "Closure" } [3]=> object(ReflectionMethod)#8 (2) { ["name"]=> string(4) "call" ["class"]=> string(7) "Closure" } }
Output for hhvm-3.12.0
Cloneable outside:bool(false) object(Closure$getInstance;1521550670$a264f8c44cb9a8a2919ef522841238c$)#3 (1) { ["this"]=> object(Singleton)#1 (0) { } } array(10) { [0]=> object(ReflectionMethod)#6 (2) { ["name"]=> string(8) "__invoke" ["class"]=> string(63) "Closure$getInstance;1521550670$a264f8c44cb9a8a2919ef522841238c$" } [1]=> object(ReflectionMethod)#7 (2) { ["name"]=> string(11) "__construct" ["class"]=> string(7) "Closure" } [2]=> object(ReflectionMethod)#8 (2) { ["name"]=> string(5) "__get" ["class"]=> string(7) "Closure" } [3]=> object(ReflectionMethod)#9 (2) { ["name"]=> string(5) "__set" ["class"]=> string(7) "Closure" } [4]=> object(ReflectionMethod)#10 (2) { ["name"]=> string(7) "__isset" ["class"]=> string(7) "Closure" } [5]=> object(ReflectionMethod)#11 (2) { ["name"]=> string(7) "__unset" ["class"]=> string(7) "Closure" } [6]=> object(ReflectionMethod)#12 (2) { ["name"]=> string(11) "__debuginfo" ["class"]=> string(7) "Closure" } [7]=> object(ReflectionMethod)#13 (2) { ["name"]=> string(4) "bind" ["class"]=> string(7) "Closure" } [8]=> object(ReflectionMethod)#14 (2) { ["name"]=> string(6) "bindto" ["class"]=> string(7) "Closure" } [9]=> object(ReflectionMethod)#15 (2) { ["name"]=> string(4) "call" ["class"]=> string(7) "Closure" } }
Output for hhvm-3.10.0
Cloneable outside:bool(false) object(Closure$getInstance;1521550670$f531f62b6d17134a8412e961586062d6$)#3 (1) { ["this"]=> object(Singleton)#1 (0) { } } array(9) { [0]=> object(ReflectionMethod)#6 (2) { ["name"]=> string(8) "__invoke" ["class"]=> string(64) "Closure$getInstance;1521550670$f531f62b6d17134a8412e961586062d6$" } [1]=> object(ReflectionMethod)#7 (2) { ["name"]=> string(11) "__construct" ["class"]=> string(7) "Closure" } [2]=> object(ReflectionMethod)#8 (2) { ["name"]=> string(11) "__debuginfo" ["class"]=> string(7) "Closure" } [3]=> object(ReflectionMethod)#9 (2) { ["name"]=> string(5) "__get" ["class"]=> string(7) "Closure" } [4]=> object(ReflectionMethod)#10 (2) { ["name"]=> string(5) "__set" ["class"]=> string(7) "Closure" } [5]=> object(ReflectionMethod)#11 (2) { ["name"]=> string(7) "__isset" ["class"]=> string(7) "Closure" } [6]=> object(ReflectionMethod)#12 (2) { ["name"]=> string(7) "__unset" ["class"]=> string(7) "Closure" } [7]=> object(ReflectionMethod)#13 (2) { ["name"]=> string(4) "bind" ["class"]=> string(7) "Closure" } [8]=> object(ReflectionMethod)#14 (2) { ["name"]=> string(6) "bindto" ["class"]=> string(7) "Closure" } }
Output for 5.4.0 - 5.6.28
Cloneable outside:bool(false) object(Closure)#3 (1) { ["this"]=> object(Singleton)#1 (0) { } } array(3) { [0]=> &object(ReflectionMethod)#5 (2) { ["name"]=> string(11) "__construct" ["class"]=> string(7) "Closure" } [1]=> &object(ReflectionMethod)#6 (2) { ["name"]=> string(4) "bind" ["class"]=> string(7) "Closure" } [2]=> &object(ReflectionMethod)#7 (2) { ["name"]=> string(6) "bindTo" ["class"]=> string(7) "Closure" } }
Output for 5.1.0 - 5.3.29
Parse error: syntax error, unexpected T_OBJECT_OPERATOR in /in/tkcCZ on line 25
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_OBJECT_OPERATOR in /in/tkcCZ on line 25
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/tkcCZ 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/tkcCZ 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/tkcCZ on line 5
Process exited with code 255.