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class Singleton{	/**	 * Stores instances	 *	 * @var array	 */	static private $_instances = array();	/**	 * Singleton Pattern	 */	private function __construct()	{}	/**	 * Returns an instance of a class. $instanceName can be used to create	 * multitons.	 *	 * @param string $class	 * @param string $instanceName	 * @return class	 */	static public function &getInstance($class, $instanceName = null)	{		$instance =& self::$_instances[$instanceName][$class];		if (!isset($instance) && !$instance instanceof $class) {			$instance = new $class;		}		return $instance;	}	/**	 * Removes an instance of a class	 *	 * @param string $class	 * @param string $instanceName	 */	static public function removeInstance($class, $instanceName = null)	{		$instance =& self::$_instances[$instanceName][$class];		if (isset($instance) && $instance instanceof $class) {			unset(self::$_instances[$instanceName][$class]);		}	}}