PHP programming forum. Ask questions or help people concerning PHP code. Don't understand a function? Need help implementing a class? Don't understand a class? Here is where to ask. Remember to do your homework!
Is it possible that two computers on a network would have the same IP address? this seems to have been a case which affected the login on my site, and cause two people to be logged into each others accounts.
Then it is likely that their computers do not have the same IP address but that they go through a proxy to access the internet and it is the proxy's IP address that you are seeing.