public static function setKindOfReportLog(string $sKindOfReportLog)
    {
        if ($sKindOfReportLog === 'screen' || $sKindOfReportLog === 'all') { self::$_sKindOfReportLog = $sKindOfReportLog; }
        else { self::$_sKindOfReportLog = 'error_log'; }
    }