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<?php class Singleton{ private $instance; private function __construct(){} public static function instance() { if (is_null($this->instance)){ $this->instance = new static; } return $this->instance; } } $obj1 = Singleton::instance(); $obj2 = Singleton::instance(); var_dump(spl_object_hash($obj1), spl_object_hash($obj2));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Using $this when not in object context in /in/ufE7h:15 Stack trace: #0 /in/ufE7h(30): Singleton::instance() #1 {main} thrown in /in/ufE7h on line 15
Process exited with code 255.

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