A simple php encryption and decryption function (dynamic encryption)

Copy codeThe Code is as follows:
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', '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 )){
// Integrity Verification Failed
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 ');