unshorten.php

<?php

/**
 * @link http://jonathonhill.net/2012-05-18/unshorten-urls-with-php-and-curl/
 */
function unshorten_url($url) {
    $ch = curl_init($url);
    curl_setopt_array($ch, array(
        CURLOPT_FOLLOWLOCATION => TRUE,  // the magic sauce
        CURLOPT_RETURNTRANSFER => TRUE,
        CURLOPT_SSL_VERIFYHOST => FALSE, // suppress certain SSL errors
        CURLOPT_SSL_VERIFYPEER => FALSE, 
    ));
    curl_exec($ch);
    $url = curl_getinfo($ch, CURLINFO_EFFECTIVE_URL);
    curl_close($ch);
    return $url;
}