<form action="" method="post">
YouTube URL:  <input type="text" name="url" /><br />
<input type="submit" name="submit" value="Submit me!" />
</form>


<?php

error_reporting(E_ALL);

if ($_POST) {
$request_url = $HTTP_POST_VARS['url'];
$xml = simplexml_load_file($request_url) or die("feed not loading");
echo $xml->html[0];
}

?>