I really need help. For my site, to make sure users haven't signed up twice I need to see that their ips are different. I am currently using this to find the ip:

[PHP]$ip = $_SERVER['REMOTE_ADDR'];[/PHP]

Now, this will not help me if someone is behind a proxy. The program on this site (in the tools section) can identify alot of proxies (except for very secure ones). Does anyone know the code for this, or a similar one. I liked that this program would :

*. Tell you the original ip
2. It told you that a proxy was deteced even if it couldn't get the original ip.
*. I pretty much liked the entire script.



THANKS !!!!!!!!!!!!!!!!!!! ps: I might offer a small reward for help