note 51651 deleted from language.oop5.patterns by danbrown

Note Submitter: scottmattocks at php dot net ---- In respone to JimmyPaterson: Since the singleton method isn't declared final, you can override it in the children classes. First you have to change the singleton class a little to accept a classname parameter. class Singleton { // Hold an instance of the class private static $instance; // A private constructor; prevents direct creation of object private function __construct() { echo 'I am constructed'; } // The singleton method public static function singleton($classname) { if (!isset(self::$instance)) { self::$instance = new $classname; } return self::$instance; } } class SubClass extends Singleton { public static function singleton() { parent::singleton(__CLASS__); } } $singletonInstance = SubClass::singleton();