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');