BitLy API v3 Shorten PHP

bitly_api_v3_shorten.php

<?php
function bitly_shorten($url) {
    $login = "bitly_login";
    $apikey = "bitly_apikey";
    $format = "json";
    $query = array("login"   => $login,
                   "apiKey"  => $apikey,
                   "longUrl" => urlencode($url),
                   "format"  => $format);

    $query = http_build_query($query);
    $final_url = "http://api.bitly.com/v3/shorten?".$query;

    if (function_exists("file_get_contents"))
        $response = file_get_contents($final_url);
    else {
        $ch = curl_init();
        $timeout = 5;
        curl_setopt($ch, CURLOPT_URL, $final_url);
        curl_setopt($ch, CURLOPT_HEADER, 0);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
        $response = curl_exec($ch);
        curl_close($ch);
    }

    $response = json_decode($response);

    if($response->status_code == 0 && $response->status_txt == "OK")
        return $response->data->url;
    else
        return null;
}