public function getReturnCodeName($returnCode)
    {
        if (isset(self::$qosLevels[$returnCode])) {
            return self::$qosLevels[$returnCode][0];
        }

        return 'Unknown '.$returnCode;
    }
public function getReturnCodeName($returnCode)
    {
        if (isset(self::$qosLevels[$returnCode])) {
            return self::$qosLevels[$returnCode][0];
        }

        return 'Unknown '.$returnCode;
    }
public function getReturnCodeName ( $ returnCode ) { if ( isset ( self :: $ qosLevels [ $ returnCode ] ) ) { return self :: $ qosLevels [ $ returnCode ] [ 0 ] ; } return 'Unknown ' . $ returnCode ; }
Indicates if the given return code is an error.

@param int $returnCode

@return bool
Indicates if the given return code is an error .