Want to look up IP addresses to a geographical location? Firstly, download maxmind_geoip.php and GeoIP binary database from MaxMind. I copied them to a universal location on a server so I can use it across applications.
$gi = geoip_open("/usr/local/share-php/GeoIP.dat",GEOIP_STANDARD);
$location = geoip_country_code_by_addr($gi, $_SERVER['REMOTE_ADDR']);
There we go 4 lines.
$location will return the 2 letter ISO country code for that country, for you to do whatever you want with!<img src="images/flags/'.strtolower($location).'.png" alt="'.$location.'" title="'.$location.'" />
You could even use the PECL extenstion or the PEAR extenstion if you're feeling fancy.