/**
* creates singleton instance and passes all options to class constructor
*
* @see Xapp_Console::__construct
* @error 10902
* @param null|string $driver expects the driver string to load
* @param array $options expects an driver dependent option array
* @return null|Xapp_Console
*/
public static function instance($driver = null, array $options = array())
{
if (self::$_instance === null) {
self::$_instance = new self($driver, $options);
}
return self::$_instance;
}
