Extract YouTube ID from url
$link = "http://www.youtube.com/watch?v=oHg5SJYRHA0&lololo";
$video_id = explode("?v=", $link); // For videos like http://www.youtube.com/watch?v=...
if (empty($video_id[1]))
$video_id = explode("/v/", $link); // For videos like http://www.youtube.com/watch/v/..
$video_id = explode("&", $video_id[1]); // Deleting any other params
$video_id = $video_id[0];