Get weather information based on IP

weather.php

<?php

function get_client_ip()
{
    $ipaddress = '';
    if (getenv('HTTP_CLIENT_IP'))
        $ipaddress = getenv('HTTP_CLIENT_IP');
    else if (getenv('HTTP_X_FORWARDED_FOR'))
        $ipaddress = getenv('HTTP_X_FORWARDED_FOR');
    else if (getenv('HTTP_X_FORWARDED'))
        $ipaddress = getenv('HTTP_X_FORWARDED');
    else if (getenv('HTTP_FORWARDED_FOR'))
        $ipaddress = getenv('HTTP_FORWARDED_FOR');
    else if (getenv('HTTP_FORWARDED'))
        $ipaddress = getenv('HTTP_FORWARDED');
    else if (getenv('REMOTE_ADDR'))
        $ipaddress = getenv('REMOTE_ADDR');
    else
        $ipaddress = 'UNKNOWN';
    return $ipaddress;
}

$ip = get_client_ip(); // the IP address to query

//test ip
//$ip = "95.180.67.153"; // Beograd, Rakovica

$query = @unserialize(file_get_contents('http://ip-api.com/php/' . $ip));

if ($query && $query['status'] == 'success')
{
    //get Coords
    $lat = $query['lat'];
    $lon = $query['lon'];

    $url = "http://api.openweathermap.org/data/2.5/weather?lat={$lat}&lon={$lon}";

    $djson = file_get_contents($url);

    var_dump(json_decode($djson));
}
else
{
    $url = "http://api.openweathermap.org/data/2.5/weather?q=Paris";
    $djson = file_get_contents($url);

    var_dump(json_decode($djson));
}