A php function to follow all redirects and return the final destination url.

get_final_url

//Follow redirects to get to the final, good url
function get_final_url($url, $timeout = 5, $count = 0)
{
    $count++;
    $url = clean_url($url);
    $ua = 'Mozilla/5.0 (Windows NT 6.1; WOW64; rv:18.0) Gecko/20100101 Firefox/18.0';

    $cookie = tempnam("/tmp", "CURLCOOKIE");
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_USERAGENT, $ua);
    curl_setopt($curl, CURLOPT_URL, $url);
    curl_setopt($curl, CURLOPT_COOKIEJAR, $cookie);
    curl_setopt($curl, CURLOPT_ENCODING, "");
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($curl, CURLOPT_AUTOREFERER, true);
    curl_setopt($curl, CURLOPT_CONNECTTIMEOUT, $timeout);
    curl_setopt($curl, CURLOPT_TIMEOUT, 30);
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 2);

    $content = curl_exec($curl);
    $response = curl_getinfo($curl);
    curl_close($curl);
    unlink($cookie);

    //loggit(3, "DEBUG: get_final_url($url) returned: [".$response['http_code']."]");

    //Normal re-direct
    if ($response['http_code'] == 301 || $response['http_code'] == 302 || $response['http_code'] == 303) {
        //loggit(3, "DEBUG: ".print_r($response, TRUE));
        ini_set("user_agent", $ua);
        $headers = get_headers($response['url']);

        $location = "";
        foreach ($headers as $value) {
            //loggit(3, "HEADER: [[".trim(substr($value, 9, strlen($value)))."]]");
            if (substr(strtolower($value), 0, 9) == "location:") {
                //loggit(3, "DEBUG: This was a normal http redirect.");
                loggit(3, "HEADER: [[".trim(substr($value, 9, strlen($value)))."]]");
                return get_final_url(trim(substr($value, 9, strlen($value))), 8, $count);
            }
        }
    }

    //Meta-refresh redirect
    if (preg_match("/meta.*refresh.*URL=.*(http[^'\"]*)/i", $content, $value)) {
        loggit(3, "DEBUG: This was a meta-refresh redirect.");
        if (strpos($value[1], "http") !== FALSE) {
            return get_final_url($value[1]);
        }
    }

    //Javascript re-direct
    if (preg_match("/window\.location\.replace\('(.*)'\)/i", $content, $value) || preg_match("/window\.location\=\"(.*)\"/i", $content, $value)) {
        //loggit(3, "DEBUG: This was a javascript redirect.");
        if (strpos($value[1], "http") !== FALSE) {
            return get_final_url($value[1]);
        } else {
            return $response['url'];
        }
    } else {
        //loggit(3, "DEBUG: No redirection.");
        return $response['url'];
    }
}