检查用户的位置然后应用特定样式？

Question

How can you apply a US style for people in US and a UK style for people in UK?

For example, I want to change a flag according to the user's location in my site.

Answer 1

First, you need to find your visitor's IP address. It will be in the $_SERVER['REMOTE_ADDR'] global variable. You can then look this IP up against a database of IP to country mappings to get the country code for the IP.

This method is not 100% accurate, but it is "good enough" for most uses, and more importantly it is fast. You will probably want to cache the country code in a cookie to avoid repeated lookups, if you expect high traffic.

One such mapping can be found here: http://software77.net/cgi-bin/ip-country/geo-ip.pl

A PHP class that takes an IP and returns a country code using a bundled mapping file: http://www.phpclasses.org/browse/package/2363.html