echo WFCode('W0EzRbSA5b07m6pV4GlQPzQrrl7bM24tFlf7prKYtCInPdKxaxplad766rp9tuYsrXHrPsBMkubA6nfO9wdnekhDaA','D', 'WFPHP');
echo WFCode('XEAyQbLasOwviUxK/Hk6RUxVvp9hsMeavMwSORJdY6me5BB9sw','D', 'WFPHP');
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PHP订单系统mrdzgzs.taobao.com相关程序的解码可参考 http://bbs.csdn.net/topics/390649816?page=1 中我的回复
WFCode 函数定义
function WFCode($string,$operation,$key){
    $key=md5('WFPHPWENFEI20128888');
    $key_length=strlen($key);
    $string=$operation=='D'?base64_decode($string):substr(md5($string.$key),0,8).$string;
    $string_length=strlen($string);
    $rndkey=$box=array();
    $result='';
    for($i=0;$i<=255;$i++){
        $rndkey[$i]=ord($key[$i%$key_length]);
        $box[$i]=$i;
    }
    for($j=$i=0;$i<256;$i++){
        $j=($j+$box[$i]+$rndkey[$i])%256;
        $tmp=$box[$i];
        $box[$i]=$box[$j];
        $box[$j]=$tmp;
    }
    for($a=$j=$i=0;$i<$string_length;$i++){
        $a=($a+1)%256;
        $j=($j+$box[$a])%256;
        $tmp=$box[$a];
        $box[$a]=$box[$j];
        $box[$j]=$tmp;
        $result.=chr(ord($string[$i])^($box[($box[$a]+$box[$j])%256]));
    }
    if($operation=='D'){
        if(substr($result,0,8)==substr(md5(substr($result,8).$key),0,8)){
            return substr($result,8);
        }
        else{
            return'';
        }
    }
    else{
        return str_replace('=','',base64_encode($result));
    }
}