I want to create a something where a user can submit a link (http://www.example.com?key=value) then be returned with a new link which will redirect to the link provided in a way that is traceable. (http://trackedlink.com/[trackid]).
I was thinking about adding a get value to the end of the link redirect eg, http://www.example.com?key=value&trackid=[trackid]
My concern is that although extremely unlikely this may override an already set get value (trackid). Is there any truely safe way to do this?