Mine

	if (strstr($_GET['url'],"youtube.com")){
		$data = @file_get_contents($_GET['url']);
		@preg_match('#/watch_fullscreen\?video_id=([a-z0-9-_]+)&l=([0-9]+)&t=([a-z0-9-_]+)#i', $data, $matches);
		if (ereg($matches[1], $_GET['url'])) {
			Header("Location: http://www.youtube.com/get_video?video_id=$matches[1]&l=$matches[2]&t=$matches[3]");
		} 
	}