URL shortener using google's and CURL.

_get_short_url.php

<?php

define("DEFAULT_URL_SHORTENER_API_URL", "https://www.googleapis.com/urlshortener/v1/url");

function _get_short_url($longUrl) {
    $curl = curl_init();
    $options = array(
        CURLOPT_CONNECTTIMEOUT => 0,
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_SSL_VERIFYPEER => false,
        CURLOPT_SSL_VERIFYHOST => false,
        CURLOPT_POST => true, 
        CURLOPT_HTTPHEADER => array("Content-Type: application/json"), 
        CURLOPT_URL => DEFAULT_URL_SHORTENER_API_URL, 
        CURLOPT_POSTFIELDS => json_encode(array("longUrl" => $longUrl))
    );

    curl_setopt_array($curl, $options);

    if (false === ($resp = curl_exec($curl))) {
        trigger_error("Error " . curl_errno($curl) . ": " . curl_error($curl));
        curl_close($curl);
        return false;
    }

    curl_close($curl);
    $resp = utf8_encode($resp);
    $json = json_decode((string) $resp, true);
    return $json["id"];
}