Undefined variable: site

File: /mnt/pc-www/dod/video.php (432) Error 8

428	$url = parse_url($video['video_src']);
429	if(isset($url['host']))
430		$site = $url['host'];
431	switch($site){
432		case 'player.vimeo.com': case 'wwww.vimeo.com': case 's3.amazonaws.com':
433			return 'vimeo';
434		case 'dirtondirt': case '':
435			return 'dirtondirt';
436	}
437	return 'error';