这是我用PHP显示youtube视频详细信息的代码，但它不起作用。网页是空白的

Question

这是我显示YouTube视频详细信息的代码，但它无效。该网页为空白。这是代码：

<?php
$json_output = file_get_contents("http://gdata.youtube.com/feeds/api/videos/aNgnkIvLdpU?v=2&alt=json");
$json = json_decode($json_output, true);

//This gives you the video description
$video_description = $json['entry']['media$group']['media$description']['$t'];

//This gives you the video views count
$view_count = $json['entry']['yt$statistics']['viewCount'];

//This gives you the video title
$video_title = $json['entry']['title']['$t'];

echo $video_title;

echo $view_count;

echo $video_description; 
?>

Answer 1

此网址无效：

Warning: file_get_contents(http://gdata.youtube.com/feeds/api/videos/aNgnkIvLdpU?v=2&alt=json): failed to open stream: HTTP request failed! HTTP/1.0 410 Gone