with functions function &get_instance() {
static $instance;
if(empty($instance)) {
$instance = new SingletonClass();
}
return $instance;
}
with objects class Singleton {
private static $instance = null;
private static function __construct() { }
public function get_instance() {
if(empty(self::$instance) { self::$instance = new Singleton(); }
return self::$instance;
}
}
Complications
The function based version implements the code equivalent of security by obscurity. It doesn't really enforce a single instance of a class, but a revised version can be used to abstract out singleton creation
