PHP - Geolocalization by IP address

geoip.php

<?php

define('GEOIP_CACHE_TIME', 5184000); // 5184000 = 60 days

	/**
	 * Returns the country of an IP address
	 * If IP is cached and less than 2 months old, otherwhise requests it to geoplugin.com API
	 *
	 * @string $ip The IP address
	 * @bool $justcountry If you want the full array or just the country
	 * @returns The two-letter country, array with all data if $justcountry=false or false if nothing found
	 */
	public function geoIp( $ip = '', $justcountry = true )
	{
		if ( $ip == '' )
		{
			$ip = $_SERVER['REMOTE_ADDR'];
		}

		if ( !filter_var( $ip, FILTER_VALIDATE_IP ) )
		{
			return false;
		}


		$file = CACHE_PATH . $ip . '.json';

		if ( file_exists( $file ) && time() < filemtime( $file ) + GEOIP_CACHE_TIME )
		{
			$data = include( $file );
		}
		else
		{
			$data = @json_decode( file_get_contents('http://www.geoplugin.net/json.gp?ip=' . $ip), true );

			if ( !is_array( $data ) )
			{
				return false;
			}

			file_put_contents( $file, '<?php return ' . var_export( $data, true ) . ';' );
		}


		if ( $justcountry == false )
		{
			return $data;
		}
		else
		{
			return $data['geoplugin_countryCode'];
		}

		return false;
	}




/**
 * Examples
 */
 
if ( geoIp() == 'ES' )
{
  // Visitor is from Spain
}


// User's currency
$data = geoIp( '89.140.161.225', true );
echo 'User currency is ' . $data['geoplugin_currencyCode'] . '.';


// Full Response Example
/*
{
  "geoplugin_request":"89.140.161.225",
  "geoplugin_status":200,
  "geoplugin_credit":"Some of the returned data includes GeoLite data created by MaxMind, available from <a href=\\'http:\/\/www.maxmind.com\\'>http:\/\/www.maxmind.com<\/a>.",
  "geoplugin_city":"Barcelona",
  "geoplugin_region":"Catalonia",
  "geoplugin_areaCode":"0",
  "geoplugin_dmaCode":"0",
  "geoplugin_countryCode":"ES",
  "geoplugin_countryName":"Spain",
  "geoplugin_continentCode":"EU",
  "geoplugin_latitude":"41.3853",
  "geoplugin_longitude":"2.1774",
  "geoplugin_regionCode":"56",
  "geoplugin_regionName":"Catalonia",
  "geoplugin_currencyCode":"EUR",
  "geoplugin_currencySymbol":"&#8364;",
  "geoplugin_currencySymbol_UTF8":"\u20ac",
  "geoplugin_currencyConverter":0.8018
};
*/

Thank you!