用特殊字符替换字符串

I am trying to pass id=%ADD_CODE as url params but when I am trying to get in php it is replacing %a with �. I need to keep the url param values the way it is.

Example

http://localhost/detect.php?id=%ADD_CODE%SUBID1&cid=%COOKIEID

Result when I am trying to echo key and value

id �DD_CODE%SUBID1
cid %COOKIEID

Any ideas?

Use Urlencode

localhost.com/detect.php?id=urlencode($userinput)

Make sure you are using urlencode() on your parameters:

http://ca2.php.net/urlencode