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<?php 
/**
 * Retrieves the thumbnail from a youtube or vimeo video
 * @param - $src: the url of the "player"
 * @return - string
 * @todo - do some real world testing. 
 * 
**/
function get_video_thumbnail( $src ) {

	$url_pieces = explode('/', $src);
	
	if ( $url_pieces[2] == 'player.vimeo.com' ) { // If Vimeo

		$id = $url_pieces[4];
		$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[4]);
		$id = $extract_id[0];
		$thumbnail = 'http://img.youtube.com/vi/' . $id . '/mqdefault.jpg';

	}

	return $thumbnail;

}