Геотаргетинг и геолокация на PHP

require_once('geoplugin.class.php');
 
$geoplugin = new geoPlugin();
//locate the IP
$geoplugin->locate();
// думаю нижеследующий блок не нуждается в пояснениях, из его кода видно какие значения возвращает нам скрипт
echo "Geolocation results for {$geoplugin->ip}: <br />\n".
    "City: {$geoplugin->city} <br />\n".
    "Region: {$geoplugin->region} <br />\n".
    "Area Code: {$geoplugin->areaCode} <br />\n".
    "DMA Code: {$geoplugin->dmaCode} <br />\n".
    "Country Name: {$geoplugin->countryName} <br />\n".
    "Country Code: {$geoplugin->countryCode} <br />\n".
    "Longitude: {$geoplugin->longitude} <br />\n".
    "Latitude: {$geoplugin->latitude} <br />\n".
    "Currency Code: {$geoplugin->currencyCode} <br />\n".
    "Currency Symbol: {$geoplugin->currencySymbol} <br />\n".
    "Exchange Rate: {$geoplugin->currencyConverter} <br />\n";

class geoPlugin {
    //the geoPlugin server
    var $host = 'http://www.geoplugin.net/php.gp?ip={IP}&base_currency={CURRENCY}';
 
    //the default base currency
    var $currency = 'USD';
 
    //initiate the geoPlugin vars
    var $ip = null;
    var $city = null;
    var $region = null;
    var $areaCode = null;
    var $dmaCode = null;
    var $countryCode = null;
    var $countryName = null;
    var $continentCode = null;
    var $latitute = null;
    var $longitude = null;
    var $currencyCode = null;
    var $currencySymbol = null;
    var $currencyConverter = null;
 
    function geoPlugin() {
 
    }
 
    function locate($ip = null) {
 
        global $_SERVER;
 
        if ( is_null( $ip ) ) {
            $ip = $_SERVER['REMOTE_ADDR'];
        }
 
        $host = str_replace( '{IP}', $ip, $this->host );
        $host = str_replace( '{CURRENCY}', $this->currency, $host );
 
        $data = array();
 
        $response = $this->fetch($host);
 
        $data = unserialize($response);
 
        //set the geoPlugin vars
        $this->ip = $ip;
        $this->city = $data['geoplugin_city'];
        $this->region = $data['geoplugin_region'];
        $this->areaCode = $data['geoplugin_areaCode'];
        $this->dmaCode = $data['geoplugin_dmaCode'];
        $this->countryCode = $data['geoplugin_countryCode'];
        $this->countryName = $data['geoplugin_countryName'];
        $this->continentCode = $data['geoplugin_continentCode'];
        $this->latitude = $data['geoplugin_latitude'];
        $this->longitude = $data['geoplugin_longitude'];
        $this->currencyCode = $data['geoplugin_currencyCode'];
        $this->currencySymbol = $data['geoplugin_currencySymbol'];
        $this->currencyConverter = $data['geoplugin_currencyConverter'];
 
    }
 
    function fetch($host) {
 
        if ( function_exists('curl_init') ) {
 
            //use cURL to fetch data
            $ch = curl_init();
            curl_setopt($ch, CURLOPT_URL, $host);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
            curl_setopt($ch, CURLOPT_USERAGENT, 'geoPlugin PHP Class v1.0');
            $response = curl_exec($ch);
            curl_close ($ch);
 
        } else if ( ini_get('allow_url_fopen') ) {
 
            //fall back to fopen()
            $response = file_get_contents($host, 'r');
 
        } else {
 
            trigger_error ('geoPlugin class Error: Cannot retrieve data. Either compile PHP with cURL support or enable allow_url_fopen in php.ini ', E_USER_ERROR);
            return;
 
        }
 
        return $response;
    }
 
    function convert($amount, $float=2, $symbol=true) {
 
        //easily convert amounts to geolocated currency.
        if ( !is_numeric($this->currencyConverter) || $this->currencyConverter == 0 ) {
            trigger_error('geoPlugin class Notice: currencyConverter has no value.', E_USER_NOTICE);
            return $amount;
        }
        if ( !is_numeric($amount) ) {
            trigger_error ('geoPlugin class Warning: The amount passed to geoPlugin::convert is not numeric.', E_USER_WARNING);
            return $amount;
        }
        if ( $symbol === true ) {
            return $this->currencySymbol . round( ($amount * $this->currencyConverter), $float );
        } else {
            return round( ($amount * $this->currencyConverter), $float );
        }
    }
 
    function nearby($radius=10, $limit=null) {
 
        if ( !is_numeric($this->latitude) || !is_numeric($this->longitude) ) {
            trigger_error ('geoPlugin class Warning: Incorrect latitude or longitude values.', E_USER_NOTICE);
            return array( array() );
        }
 
        $host = "http://www.geoplugin.net/extras/nearby.gp?lat=" . $this->latitude . "&long=" . $this->longitude . "&radius={$radius}";
 
        if ( is_numeric($limit) )
            $host .= "&limit={$limit}";
 
        return unserialize( $this->fetch($host) );
 
    }
}