note 68816 added to language.oop5.patterns

An easy way to have your singleton persistent between page loads: /** * Returns an instance of the singleton class. * @return object The singleton instance */ public static function _instance() { // Start a session if not already started Session::start(); if ( false == isset( $_SESSION[ self::$_singleton_class ] ) ) { $class = self::$_singleton_class; $_SESSION[ self::$_singleton_class ] = new $class; } return $_SESSION[ self::$_singleton_class ]; } /** * Destroy the singleton object. Deleting the session variable in the * destructor does not make sense since the destructor is called every * time the script ends. */ public static function _destroy() { $_SESSION[ self::$_singleton_class ] = null; } /** * Initialize the singleton object. Use instead of constructor. */ public function _initialize( $name ) { // Something... } /** * Prevent cloning of singleton. */ private function __clone() { trigger_error( "Cloning a singleton object is not allowed.", E_USER_ERROR ); } private static $_singleton_class = __CLASS__; ---- Server IP: 66.163.161.117 Probable Submitter: 83.227.150.10 ---- X-Spam-Status: No, hits=3.1 required=5.0 tests=DATE_MISSING,FROM_NO_LOWER autolearn=no version=2.64 ---- Manual Page -- http://www.php.net/manual/en/language.oop5.patterns.php Edit -- https://master.php.net/note/edit/68816 Del: integrated -- https://master.php.net/note/delete/68816/integrated Del: useless -- https://master.php.net/note/delete/68816/useless Del: bad code -- https://master.php.net/note/delete/68816/bad+code Del: spam -- https://master.php.net/note/delete/68816/spam Del: non-english -- https://master.php.net/note/delete/68816/non-english Del: in docs -- https://master.php.net/note/delete/68816/in+docs Del: other reasons-- https://master.php.net/note/delete/68816 Reject -- https://master.php.net/note/reject/68816 Search -- https://master.php.net/manage/user-notes.php