PHP: Determination of the country by IP

get_country_by_ip.php

function get_country($ip_addr) {
    $curlopt_useragent = 'Mozilla/5.0 (Windows NT 6.1; WOW64; rv:20.0) Gecko/20100101 Firefox/20.0';
    $url = 'http://www.geoplugin.net/php.gp?ip=' . $ip_addr;
    $ch1 = curl_init();
    curl_setopt($ch1, CURLOPT_URL, $url);
    curl_setopt($ch1, CURLOPT_RETURNTRANSFER, 1);
    $result = curl_exec($ch1);
    $geoplugin = unserialize($result);
 
    if ($geoplugin[geoplugin_countryCode] != '') {
        return $geoplugin[geoplugin_countryCode];
    } else {
        $url = 'http://ipinfodb.com/ip_locator.php?ip=' . urlencode($ip_addr);
        $ch = curl_init();
 
        $curl_opt = array(
            CURLOPT_FOLLOWLOCATION => 1,
            CURLOPT_HEADER => 0,
            CURLOPT_RETURNTRANSFER => 1,
            CURLOPT_USERAGENT => $curlopt_useragent,
            CURLOPT_URL => $url,
            CURLOPT_TIMEOUT => 1,
            CURLOPT_REFERER => 'http://' . $_SERVER['HTTP_HOST'],
        );
        curl_setopt_array($ch, $curl_opt);
        $content = curl_exec($ch);
 
        if (!is_null($curl_info)) {
            $curl_info = curl_getinfo($ch);
        }
 
        curl_close($ch);
 
        if (preg_match('{<li>Country : ([^<]*)}i', $content, $regs))
            $country = $regs[1];
 
        return $country;
    }
}