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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 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
Warning: Private methods cannot be final as they are never overridden by other classes in /in/tkcCZ on line 8 Cloneable outside:bool(false) object(Closure)#3 (1) { ["this"]=> object(Singleton)#1 (0) { } } array(6) { [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" } [5]=> object(ReflectionMethod)#11 (2) { ["name"]=> string(8) "__invoke" ["class"]=> string(7) "Closure" } }
Output for 7.2.19 - 7.2.33, 7.3.6 - 7.3.33, 7.4.0 - 7.4.33
Cloneable outside:bool(false) object(Closure)#3 (1) { ["this"]=> object(Singleton)#1 (0) { } } array(6) { [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" } [5]=> object(ReflectionMethod)#11 (2) { ["name"]=> string(8) "__invoke" ["class"]=> string(7) "Closure" } }
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.18, 7.3.0 - 7.3.5
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 - 7.0.33
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 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
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 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 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 - 4.3.11, 4.4.0 - 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.

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