Is there a normal php proxy?

Question

PHP

Good afternoon everyone, such a situation
There is closed paid software
This software has a WEB interface The
software is closed and we cannot change anything in it, but we provide paid access to it for other users
Roughly speaking, exams are held there and preparation for them
Access to the exam is provided by link after user authorization
And in the future, this link is assigned to the user, so to speak, without requiring more authorization
. This is exactly the problem
. Users can transfer this link to each other and not pay for access to the exam
. That is, 15 people can be examined under one account
There was an idea to organize some kind of PHP proxy, which will stand between the WEB interface of this software and the user.
Tell me, are there any solutions that work normally?
It's just that there is a lot of use in the WEB (both cookies and JS and Flash) and many PHP proxies that I found simply don't understand the whole thing and just simply cut
it. That is, it still turns out to be incomplete work.
Yes, and the proxies themselves are already simply abandoned and do not develop ...
In general, tell me the solution to this problem, thanks

Answer 1

let's just say: apache+.htaccess +mod_rewrite+mod_proxy is the only reasonable solution in this case.