public static function isValid($action, $throw = false)
    {
        if (in_array($action, static::getActions(), true)) {
            return true;
        }

        if ($throw) {
            throw new InvalidArgumentException("Unknown gateway action '$action'.");
        }

        return false;
    }
public static function isValid($action, $throw = false)
    {
        if (in_array($action, static::getActions(), true)) {
            return true;
        }

        if ($throw) {
            throw new InvalidArgumentException("Unknown gateway action '$action'.");
        }

        return false;
    }
public static function isValid ( $ action , $ throw = false ) { if ( in_array ( $ action , static :: getActions ( ) , true ) ) { return true ; } if ( $ throw ) { throw new InvalidArgumentException ( "Unknown gateway action '$action'." ) ; } return false ; }
Returns whether the given action is valid.

@param string $action
@param bool   $throw

@return bool
Returns whether the given action is valid .