/*
@desc：php密碼加鹽函數
@param pass 原密碼
@param salt 鹽
@return ret 加密後的密碼
*/
function passsalt($pass,$salt){
$str1 = mb_substr($pass,0,5);
$str2 = mb_substr($salt,0,2);
$str3 = mb_substr($salt,-2);
$str4 = mb_substr($pass,-5);
$ret = md5($str1.$str2.$pass.$str3.$str4);
return $ret;
}

$ret = passsalt(‘12345678‘,‘abcd‘);
var_dump($ret);
 

string(22) "12345ab12345678cd45678"