一个简单的php加密解密函数（动态加密）

复制代码代码如下:
function encode_pass（$tex,$key,$type="encode"）{
    $chrArr=array（"a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z",
                  "A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z",
                  "0","1","2","3","4","5","6","7","8","9"）;
    if（$type=="decode"）{
        if（strlen（$tex）<14）return false;
        $verity_str=substr（$tex, 0,8）;
        $tex=substr（$tex, 8）;
        if（$verity_str！=substr（md5（$tex）,0,8））{
            //完整性验证失败
            return false;
        }
    }
    $key_b=$type=="decode"？substr（$tex,0,6）:$chrArr[rand（）%62].$chrArr[rand（）%62].$chrArr[rand（）%62].$chrArr[rand（）%62].$chrArr[rand（）%62].$chrArr[rand（）%62];
    $rand_key=$key_b.$key;
    $rand_key=md5（$rand_key）;
    $tex=$type=="decode"？base64_decode（substr（$tex, 6））:$tex;
    $texlen=strlen（$tex）;
    $reslutstr="";
    for（$i=0;$i<$texlen;$i++）{
        $reslutstr.=$tex{$i}^$rand_key{$i%32};
    }
    if（$type！="decode"）{
        $reslutstr=trim（$key_b.base64_encode（$reslutstr）,"=="）;
        $reslutstr=substr（md5（$reslutstr）, 0,8）.$reslutstr;
    }
    return $reslutstr;
}
$psa=encode_pass（"phpcode","taintainxousad"）;
echo $psa;
echo encode_pass（$psa,"taintainxousad","decode"）;