C#位操作数与PHP

我正在尝试将一些C#代码转换为PHP。

C#代码如下：

strRequest="'auth''pid'3045'ch'ehCkPNGS'resp'1529559b837decb2e0ed2f576806f10aeda4d9cdf781acd3e53ad1c3b11a20684f131229'ip'16777343'skey'3759'reqproof'1";
byte[] sendBuffer = Encoding.ASCII.GetBytes(strRequest);
Encode(sendBuffer, strRequest.Length);
private static void Encode(byte[] buff, int size){
        byte[] tmp = new byte[8];
        tmp[0] = 103;
        tmp[1] = 97;
        tmp[2] = 109;
        tmp[3] = 101;
        tmp[4] = 115;
        tmp[5] = 112;
        tmp[6] = 121;
        tmp[7] = 0;
        if (size != 0){
            int i = size;
            int j = 0;
            int k = 0;
            do{
                if (tmp[j] == 0)
                    j = 0;
                buff[k++] ^= tmp[j++];
                --i;
            } while (i != 0);
        }
}

它应该输出一个字节数组：'59','0','24','17','27','44','37','23','8','9','57','64','64','77','82','61','14','13','47','21','17','36','10','61','43','52','35','37','21','4','30','21','47','65','76','85','88','88','80','74','18','65','84','86','9','0','16','18','75','2','81','8','1','65','22','76','80','87','85','85','69','22','72','87','0','8','1','18','68','29','94','2','9','3','68','72','72','6','2','9','86','22','69','74','6','5','92','6','64','18','72','86','0','95','85','69','72','77','1','80','94','84','65','66','64','59','8','29','57','66','70','78','80','86','94','81','64','44','10','12','4','20','57','64','71','76','94','61','31','0','2','0','11','8','14','11','57','66',

我的等效PHP代码如下：

<?php
$strReq="''auth''''pid''3045''ch''atGzgVH5''resp''1529559b837decb2e0ed2f576806f10ac7d8b28205dcbd64c59666a11d43b814024837cb''ip''16777343''skey''1292''reqproof''1";
$strReqLen = strlen($strReq);
$strHex = unpack("C*",$strReq);
$test = Encode($strHex,$strReqLen);
print_r ($test);
function Encode($buff, $size){
$tmp = array(103,97,109,101,115,112,121,0);
$tester = array();
if ($size != 0){
$i = $size;
$j = 0;
$k = 0;
do {
    if($tmp[$j] == 0){
        $j = 0;
    }       
    $buff[$k++] ^= $tmp[$j++];
    --$i;
} while ($i != 0);
}
return $buff;
}
?>

但是不会像C#代码那样输出任何内容。

非常感谢您的帮助。

感谢

Dave