note 97639 added to language.oop5.late-static-bindings

If you're still stuck on a pre-5.3 codebase then you can fake a singleton superclass like this. It ain't pretty, though. To do it you pass the type info down the stack manually and then abuse call_user_func to pass the value back to the originating class so that you can access it's static properties. <?php abstract class Singleton { protected function __construct() {} protected function __clone() {} public function instance($class) { $member = 'instance'; $instance = self::getStaticMember($class, $member); if (!$instance instanceof $class) { $instance = new $class(); self::setStaticMember($class, $member, $instance); } return $instance; } protected function setStaticMember($class, $member, $value) { call_user_func(array($class, __FUNCTION__), $member, $value); } protected function getStaticMember($class, $member) { return call_user_func(array($class, __FUNCTION__), $member); } } class MySingleton extends Singleton { protected static $instance = null; public function instance() { return parent::instance(__CLASS__); } protected function setStaticMember($member, $value) { self::$$member = $value; } protected function getStaticMember($member) { return self::$$member; } } ?> ---- Server IP: 69.147.83.197 Probable Submitter: 195.24.233.122 ---- Manual Page -- http://www.php.net/manual/en/language.oop5.late-static-bindings.php Edit -- https://master.php.net/note/edit/97639 Del: integrated -- https://master.php.net/note/delete/97639/integrated Del: useless -- https://master.php.net/note/delete/97639/useless Del: bad code -- https://master.php.net/note/delete/97639/bad+code Del: spam -- https://master.php.net/note/delete/97639/spam Del: non-english -- https://master.php.net/note/delete/97639/non-english Del: in docs -- https://master.php.net/note/delete/97639/in+docs Del: other reasons-- https://master.php.net/note/delete/97639 Reject -- https://master.php.net/note/reject/97639 Search -- https://master.php.net/manage/user-notes.php