A Java mac check domain algorithm. Can any expert help rewrite it into a PHP version?

Question

A Java mac check domain algorithm, which expert can help rewrite it into a PHP version.
Message format: Domain 0|Domain 1|Domain 2|……|Domain n
Domain n is the MAC verification domain

public static byte[] getMac(byte[] dt, int mlen) {
        int n, k, len, ilen;
        // original input String length
        len = dt.length;
        // 原始串和mac长度的余数
        k = len % mlen;
        //
        n = mlen - k;
        ilen = len + n;
        byte[] bt = new byte[ilen];
        for (int i = 0; i < len; i++) {
            dt[i] = (byte) (dt[i] > 0x00 ? dt[i] : dt[i] + 256);
            bt[i] = dt[i];
        }
        bt[len] = 127;

        byte bo[] = new byte[mlen];
        for (int i = 0; i < ilen;) {
            for (int j = 0; j < mlen; j++) {
                bo[j] ^= bt[i];
                i++;
            }
        }

        for (int i = 0; i < mlen; i++) {
            // 如果遇到\r \n

            if ((bo[i] >= 0x00 ? bo[i] : bo[i] + 256) >= 0x80) { // "\r"
                bo[i] ^= 0x80;
            }

            if (bo[i] == 0x0d) { // "\r"
                bo[i] = 0x4d;
            }
            if (bo[i] == 0x0a) { // "\n"
                bo[i] = 0x4a;
            }
            if (bo[i] == 0x3a) { // ":"
                bo[i] = 0x7a;
            }
            if (bo[i] == 0x7c) { // "|"
                bo[i] = 0x3c;
            }
            if (bo[i] == 0x00) { // "0"
                bo[i] = 0x40;
            }

        }
        return bo;
    }

Answer 1

public static function getMac($dt, $mlen) {
        int $n, $k, $len, $ilen;
        // original input String length
        $len = array_length($dt);
        // 原始串和mac长度的余数
        $k = $len % $mlen;
        //
        $n = $mlen - $k;
        $ilen = $len + $n;
        $bt = [];
        for (int $i = 0; $i < $len; $i++) {
            $dt[$i] = $dt[$i] > 0x00 ? $dt[$i] : $dt[$i] + 256;
            $bt[$i] = $dt[$i];
        }
        $bt[$len] = 127;

        $bo = [];
        for ($i = 0; $i < $ilen;) {
            for ($j = 0; $j < $mlen; $j++) {
                $bo[$j] ^= $bt[$i];
                $i++;
            }
        }

        for ($i = 0; $i < $mlen; $i++) {
            // 如果遇到\r \n

            if (($bo[$i] >= 0x00 ? $bo[$i] : $bo[$i] + 256) >= 0x80) { // "\r"
                $bo[$i] ^= 0x80;
            }

            if ($bo[$i] == 0x0d) { // "\r"
                $bo[$i] = 0x4d;
            }
            if ($bo[$i] == 0x0a) { // "\n"
                $bo[$i] = 0x4a;
            }
            if ($bo[$i] == 0x3a) { // ":"
                $bo[$i] = 0x7a;
            }
            if ($bo[$i] == 0x7c) { // "|"
                $bo[$i] = 0x3c;
            }
            if ($bo[$i] == 0x00) { // "0"
                $bo[$i] = 0x40;
            }

        }
        return $bo;
    }

以上是直接翻译，以下是写得更好得：

public static function getMac($dt, $mlen) {
        int $n, $k, $len, $ilen;
        // original input String length
        $len = array_length($dt);
        // 原始串和mac长度的余数
        $k = $len % $mlen;
        //
        $n = $mlen - $k;
        $ilen = $len + $n;
        $bt = [];
       
        $bt[$len] = 127;
        foreach($dt as $key => &$value) {
            $value = $value > 0x00 ? $value : $value + 256;
            $bt[$i] = $value;
        }
        unset($value);
        
        $bo = [];
        foreach($bt as $value) {
            for($j = 0; $j < $mlen; $j++) {
                $bo[$j] ^= $value;
            }
        }

        unset($value);
        foreach($bo as &$value) {
            // 如果遇到\r \n

            if (($value >= 0x00 ? $value : $value + 256) >= 0x80) { // "\r"
                $value ^= 0x80;
            }
            switch($value) {
                case 0x0d:// "\r"
                    $value = 0x4d;
                    break;
                case 0x0a:// "\n"
                    $value = 0x4a;
                    break;
                case 0x3a:// ":"
                    $value = 0x7a;
                    break;
                case 0x7c:// "|"
                    $value = 0x3c;
                    break;
                case 0x00:// "0"
                    $value = 0x40;
                    break;
            }
        }
        return $bo;
    }