Expand short url with php + curl. via http://nullpointer.ph/questions/2761/using-php-how-can-you-get-the-long-url-equivalent-of-a-short-url

url.php

<?php
if ($_GET["shorturl"]) {
    $short_url = $_GET["shorturl"];
    $ch = curl_init($short_url); 
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);
    curl_setopt($ch, CURLOPT_NOBODY, TRUE);
    curl_exec($ch);
    echo curl_getinfo($ch, CURLINFO_EFFECTIVE_URL);
    /*
    echo "<p>" . curl_getinfo($ch, CURLINFO_EFFECTIVE_URL) . "</p>";
    $info = curl_getinfo($ch);
    echo "<p>" . $info["redirect_count"] . "</p>";
    */
}
else {
    $html =<<<END
<form action="/url.php" method="get" accept-charset="utf-8">
    <p><input type="text" name="shorturl" value="">
    <input type="submit" value="Expand"></p>
</form>
END;
    echo $html;
}