Get Youtube & Vimeo thumbnails for Wordpress

function get_video_thumbnail( $src ) {
	$url_pieces = explode('/', $src);
	
	if ( $url_pieces[2] == 'vimeo.com' ) { // If Vimeo
		$id = $url_pieces[3];
		$hash = unserialize(file_get_contents('http://vimeo.com/api/v2/video/' . $id . '.php'));
		$thumbnail = $hash[0]['thumbnail_large'];
	} elseif ( $url_pieces[2] == 'www.youtube.com' ) { // If Youtube
		$extract_id = explode('?', $url_pieces[3]);
		$watchid = $extract_id[1];
        $id = substr($watchid, 2);
		$thumbnail = 'http://img.youtube.com/vi/' . $id . '/maxresdefault.jpg';
	}
	return $thumbnail;
}