public static function runtime( $fnc = null, $params = array() )
	{
		if ( is_null( $fnc ) )
		{
			return static::$runtime_class;
		}
		
		return call_user_func_array( array( static::$runtime_class, $fnc ), $params );
	}
public static function runtime( $fnc = null, $params = array() )
	{
		if ( is_null( $fnc ) )
		{
			return static::$runtime_class;
		}
		
		return call_user_func_array( array( static::$runtime_class, $fnc ), $params );
	}
public static function runtime ( $ fnc = null , $ params = array ( ) ) { if ( is_null ( $ fnc ) ) { return static :: $ runtime_class ; } return call_user_func_array ( array ( static :: $ runtime_class , $ fnc ) , $ params ) ; }
get the current runtime class name
or execute an function on the runtime class

@return string
get the current runtime class name or execute an function on the runtime class