note 93677 modified in language.oop5.patterns by danbrown

The Singleton class version wich is useable by only extending it : you would use is for example like this : <?php class Users extends Singleton { // ... public function SomeMethod() { } } ?> and in your code : <?php Users::inst()->SomeMethod(); ?> I didn't check for performance, but here is the code : <?php class Singleton { // Hold an instance of the class private static $instances = array(); // A private constructor; prevents direct creation of object final private function __construct() { } // Prevent users to clone the instance final public function __clone() { trigger_error( 'Clone is not allowed.', E_USER_ERROR ); } // The singleton method final public static function inst() { $c = get_called_class(); if( ! isset( self::$instances[$c] ) ) { self::$instances[$c] = new $c; } return self::$instances[$c]; } } ?> --was-- The Singleton class version wich is useable by only extending it : you would use is for example like this : class Users extends Singleton { ... public function SomeMethod() { } } and in your code : ... Users::inst()->SomeMethod(); ... I didn't check for performance, but here is the code : class Singleton { // Hold an instance of the class private static $instances = array(); // A private constructor; prevents direct creation of object final private function __construct() { } // Prevent users to clone the instance final public function __clone() { trigger_error( 'Clone is not allowed.', E_USER_ERROR ); } // The singleton method final public static function inst() { $c = get_called_class(); if( ! isset( self::$instances[$c] ) ) { self::$instances[$c] = new $c; } return self::$instances[$c]; } } http://php.net/manual/en/language.oop5.patterns.php