note 97638 deleted from language.oop5.late-static-bindings by danbrown

Note Submitter: James ---- 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; } } ?>