问youtube api错误
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Stack Overflow用户

提问于 2012-11-14 19:01:31

回答 1查看 530关注 0票数 0

我有PHP循环，它从Youtube频道的特定播放列表中提取视频信息，但当它遇到私人视频时会中断。它造成了一个致命的错误：

警告: main() function.main:第30行的F:\xampp\htdocs\youtube\index.php中不再存在节点警告: main() function.main:第30行的F:\xampp\htdocs\youtube\index.php中不再存在节点致命错误:在第35行的F:\xampp\htdocs\youtube\index.php中调用非对象的成员函数属性()

代码如下

<body>
<div id="mainPlayer" width="425" height="344">
</div>
</div>
<div id="mainPlaylist" class="grid_6 omega">
<h3 class="title">Legal Feed with Kate Wheeler</h3>
<ul id="playlists">
<?php
// Loop through each video in each playlist

    // read feed into SimpleXML object
    // *Moved into header to load main Video as well
$playlistFeedURL = 'http://gdata.youtube.com/feeds/api/playlists/6549D4CA7BB99B16?v=2';
    $sxml = simplexml_load_file($playlistFeedURL);
    
    // iterate over entries in feed
    foreach ($sxml->entry as $entry) {
      // get nodes in media: namespace for media information
      $media = $entry->children('http://search.yahoo.com/mrss/');
      
      // get video player URL
      $attrs = $media->group->player->attributes();
      $watch = $attrs['url'];
      
       
      
      // get video thumbnail
      $attrs = $media->group->thumbnail[0]->attributes();
      $thumbnail = $attrs['url'];
            
      // get <yt:duration> node for video length
      $yt = $media->children('http://gdata.youtube.com/schemas/2007');
      $attrs = $yt->duration->attributes();
      $length = $attrs['seconds'];
      
      //get <yt:videoId> node for Video ID
      $yt = $media->children('http://gdata.youtube.com/schemas/2007');
      $playlistVideoID = $yt->videoid;
      
      
      // get <yt:stats> node for viewer statistics
      $yt = $entry->children('http://gdata.youtube.com/schemas/2007');
      $attrs = $yt->statistics->attributes();
      $viewCount = $attrs['viewCount'];
      
      // get <gd:rating> node for video ratings
      $gd = $entry->children('http://schemas.google.com/g/2005');
      if ($gd->rating) {
        $attrs = $gd->rating->attributes();
        $rating = $attrs['average'];  
      } else {
        $rating = 0;
      }
     
      
      ?>
      <div class="item">
          <span class="thumbnail left" rel="<?php echo $entry->id; ?>">
            <a href="<?php echo $watch; ?>" rel="<?php echo $playlistVideoID; ?>" onclick="_run();"><img src="<?php echo $thumbnail;?>" /></a>
          </span>
             <a href="<?php echo $watch; ?>" rel="<?php echo $playlistVideoID; ?>" onclick="_run();"><?php echo $media->group->title; ?></a>
          <span class="attr">Duration:</span> <?php printf('%0.2f', $length/60); ?> min.
          <div class="clear"></div>
      </div>      
    <?php
    }
?>
</ul> 
</body>

请帮帮我。提前谢谢。

php

api

youtube

回答 1

Stack Overflow用户

发布于 2012-11-14 19:06:37

你可能是用DOM把html从Youtube上拿出来的？这是值得称赞的，但是如果假设所有节点都在那里的话，那就太糟糕了。

$nodes = $dom->getElementsByTagName('video');
$nodes[0]->attribute(....);  #<---but whatever if there's no video elements at all?


if ($nodes->length > 0) {
  $nodes[0]->attribute(...); #<--only does this if there was at least one video element
}

票数 0

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原文链接：

https://stackoverflow.com/questions/13385506

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