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As far as I can see, phpclasses.org doesn't get where their users are staying, it just asks them. Now, if you want an *idea* of where your users live, what you could do is write a curl script to download information from http://www.networldmap.com/TryIt.htm?GetLocation, and then parse the response, but IP addresses are not exact indicators of someone's location.
this system doesn't work
I try it with my own IP
it reply that I was in Kansas USA instead of Aix en Provence FRANCE
anyway it does working with 2 third of the IP I tried