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<?php class Singleton { private static $instance; private function __construct() { } public static function getInstance() { if (null === self::$instance) { self::$instance = new self(); } return self::$instance; } } $cl = static function() { return new self(); }; $bcl = Closure::bind($cl1, null, 'Singleton'); var_dump(Singleton::getInstance()); var_dump(Singleton::getInstance()); var_dump(Singleton::getInstance()); var_dump($bcl()); var_dump($bcl());
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $cl1 in /in/NaNa7 on line 23 Fatal error: Uncaught TypeError: Closure::bind(): Argument #1 ($closure) must be of type Closure, null given in /in/NaNa7:23 Stack trace: #0 /in/NaNa7(23): Closure::bind(NULL, NULL, 'Singleton') #1 {main} thrown in /in/NaNa7 on line 23
Process exited with code 255.

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