$wanIP=file_get_contents("http://www.whatismyip.com/automation/n09230945.asp");

function getWANIP() {
    $url = "http://automation.whatismyip.com/n09230945.asp";
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:12.0) Gecko/20100101 Firefox/12.0");
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt( $ch, CURLOPT_ENCODING, "UTF-8");
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    //UNCOMMENT TO DEBUG TO output.tmp
    //curl_setopt($ch, CURLOPT_VERBOSE, true); // Display communication with server
    //$fp = fopen("output.tmp", "w");
    //curl_setopt($ch, CURLOPT_STDERR, $fp); // Display communication with server

    $response = curl_exec($ch);
    curl_close($ch);

    if ( $response === FALSE ) {
        throw new Exception("Error while retrieving server data: " . curl_error($ch));
    }

    return $response;
}\
<?PHP

function getUserIP()
{
    $client  = @$_SERVER['HTTP_CLIENT_IP'];
    $forward = @$_SERVER['HTTP_X_FORWARDED_FOR'];
    $remote  = $_SERVER['REMOTE_ADDR'];

    if(filter_var($client, FILTER_VALIDATE_IP))
    {
        $ip = $client;
    }
    elseif(filter_var($forward, FILTER_VALIDATE_IP))
    {
        $ip = $forward;
    }
    else
    {
        $ip = $remote;
    }

    return $ip;
}


$user_ip = getUserIP();

echo $user_ip; // Output IP address [Ex: 177.87.193.134]


?>