显示youtube视频缩略图和Vimeo视频缩略图代码分享

function video_image($url){   $image_url = parse_url($url);     if($image_url['host'] == 'www.youtube.com' ||         $image_url['host'] == 'youtube.com'){         $array = explode("&", $image_url['query']);         return "http://img.youtube.com/vi/".substr($array[0], 2)."/0.jpg";     }else if($image_url['host'] == 'www.youtu.be' ||               $image_url['host'] == 'youtu.be'){         $array = explode("/", $image_url['path']);         return "http://img.youtube.com/vi/".$array[1]."/0.jpg";     }else if($image_url['host'] == 'www.vimeo.com' ||          $image_url['host'] == 'vimeo.com'){         $hash = unserialize(file_get_contents("http://vimeo.com/api/v2/video/".         substr($image_url['path'], 1).".php"));         return $hash[0]["thumbnail_medium"];     }}

<img src="<?php echo video_image('youtube URL'); ?>" />