Inverse geolocation by ip with maxmind and google maps api

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<?php

// maxmind geolitecity class is required, you can download it in http://www.maxmind.com/app/geolitecity

// define variables
$google_maps_key = '';

// import geoipcity class
require 'class/maxmind/geoipcity.inc';

// get user ip
$ip = server('HTTP_X_FORWARD_FOR');
if( !$ip ) $ip = server('REMOTE_ADDR');

// get latitude and longitude by ip
$gi = geoip_open( 'class/maxmind/GeoLiteCity.dat', GEOIP_STANDARD );
$record = geoip_record_by_addr( $gi, $ip ); 
geoip_close( $gi );

// get address by latitude and longitude
if( $record ){
	$coords = $record->latitude . ',' . $record->longitude;
	$url = 'http://maps.google.com/maps/geo?q=' . $coords . '&output=xml&key=' . $google_maps_key . '&oe=utf-8';
	$xml = simplexml_load_file( $url );
	if( isset( $xml->Response->Placemark ) )
		$address = $xml->Response->Placemark[0]->address;

	// print address
	echo $address;
}

?>