public static function rolv($similarFileName, $match = "//", $replace = "")
    {
        $filename = preg_replace($match, $replace, $similarFileName);
        if (CommonFunctions::fileexists($filename) && CommonFunctions::rfts($filename, $buf, 1, 4096, false) && (($buf=trim($buf)) != "")) {
            return $buf;
        } else {
            return null;
        }
    }