object lookupLocation() ( 
        
          string $addr
        
      )
This method returns an instance of Net_GeoIP_Location for the specified IP address. It works only with a non-free City database.
Looking up the location record
<?php
require_once "Net/GeoIP.php";
$geoip = Net_GeoIP::getInstance("/path/to/geoipdb.dat");
try {
    $location = $geoip->lookupLocation($_SERVER['REMOTE_ADDR']);
    var_dump($location);
    printf("City: %s, %s\nLatitude: %s, Longitude: %s\n",
           $location->city, $location->region,
           $location->latitude, $location->longitude);
} catch (Exception $e) {
    // Handle exception
}
?>
This method throws an exception if the IP address is invalid.