Question

我有一个PHP“foreach”脚本，用于从选定的YouTube频道中提取所有上传的视频（每个相关数据）。然后我就可以选择我想要的视频了。现在我已经在youtube论坛上提出要求了，但他们不愿意在他们的专用api之外提供帮助。

到目前为止，我只使用了一个YouTube频道，但为了让我的网站正常运行，我需要知道所有频道都能正常工作。

对.....这是问题所在。这就是我得到的。

警告：main（）[function.main]：第24行的xxxxxxxx.php中不再存在节点警告：main（）[function.main]：第24行的xxxxxxxx.php中不再存在节点致命错误：在第27行的xxxxxxxx.php中调用非对象的成员函数attributes（）

///////////////////// PHP code //////////////////////// /

 $thumb_count = 1;

 if ($thumb_count <= 50 ){
         $feedURL = 'http://gdata.youtube.com/feeds/api/users/' . $youtube . '/uploads?start-index=1&max-results=50';


// read feed into SimpleXML object
$sxml = simplexml_load_file($feedURL);

// 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[3]->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: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; 
  } 

  $videoID = substr($watch, 31, 11); 
  $vidTitle = $media->group->title;
  $channel = $entry->author->name;
  $discript = $media->group->description;

 $select .= '<table width="150" border="0">
  <tr>
    <td><div align="center"><font size="-1" >'.$media->group->title.'</font><br />
    <div class="thumbnail"><a href="xxxxxx?id='.$videoID.'">
          <img src="'.$thumbnail.'"width="120" height="90" /></a></div></div></td></tr>
</table><hr width="150" color="#FF0000" align="center" size="1" />';

 ++$thumb_count;
    }

 }

现在我尝试过这个（我的知识有限）

// get video player URL
$attrs = $media->group->player->attributes();
if (($attrs =='') || (!$attrs)) { //////no need to double up, but wanted to make sure
continue ;
}

然后加载我的页面，但不正确，仍然会出错。

警告：main（）[function.main]：第21行的xxxxxxxx.php中不再存在节点

现在看到我需要多次经历foreach循环并且有几个节点可以通过，我如何检查，绕过并继续而不会出现错误？

Answer 1

要完全删除PHP警告消息，您可以使用...

error_reporting(E_ERROR | E_PARSE);

Answer 2

尝试：

$thumb_count = 1;
if ($thumb_count <= 50 ){
    $domain = "gdata.youtube.com";
    $path = 'feeds/api/users/' . $youtube . '/uploads?start-index=1&max-results=50';

    // read feed into SimpleXML object
    $sxml = simplexml_load_file($feedURL);
    $sxml= loadXML2($domain, $path);
    if($sxml){
        // 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/');

              if($media->group->player->attributes()){
                  $attrs = $media->group->player->attributes();
                  $watch = $attrs['url']; 
              }

              // get video thumbnail
              if($media->group->thumbnail[3]->attributes()){
                  $attrs = $media->group->thumbnail[3]->attributes();
                  $thumbnail = $attrs['url']; 
              }

              // get <yt:duration> node for video length
              if($media->children('http://gdata.youtube.com/schemas/2007')){
                  $yt = $media->children('http://gdata.youtube.com/schemas/2007');
                  if($yt->duration->attributes()){
                      $attrs = $yt->duration->attributes();
                      $length = $attrs['seconds']; 
                  }

                  // get <yt:stats> node for viewer statistics
                  if($yt->statistics->attributes()){
                      $attrs = $yt->statistics->attributes();
                      $viewCount = $attrs['viewCount']; 
                  }
              }

              // get <gd:rating> node for video ratings
              if($entry->children('http://schemas.google.com/g/2005')){
                  $gd = $entry->children('http://schemas.google.com/g/2005'); 
                  if ($gd->rating & $gd->rating->attributes()) {
                    $attrs = $gd->rating->attributes();
                    $rating = $attrs['average']; 
                  } else {
                    $rating = 0; 
                  } 
              }

              $videoID = substr($watch, 31, 11); 
              $vidTitle = $media->group->title;
              $channel = $entry->author->name;
              $discript = $media->group->description;

             $select .= '<table width="150" border="0">
                <tr>
                    <td><div align="center"><font size="-1" >'.$vidTitle.'</font><br />
                            <div class="thumbnail">
                                <a href="xxxxxx?id='.$videoID.'">
                                    <img src="'.$thumbnail.'"width="120" height="90" />
                                </a>
                            </div>
                    </div></td>
                </tr>
            </table>
            <hr width="150" color="#FF0000" align="center" size="1" />';
             ++$thumb_count;
        }
    }  
}
// from: http://www.php.net/manual/es/function.simplexml-load-file.php#97077
function loadXML2($domain, $path, $timeout = 30) { 
    $fp = fsockopen($domain, 80, $errno, $errstr, $timeout); 
    if($fp) { 
        // make request 
        $out = "GET $path HTTP/1.1\r\n"; 
        $out .= "Host: $domain\r\n"; 
        $out .= "Connection: Close\r\n\r\n"; 
        fwrite($fp, $out); 

        // get response 
        $resp = ""; 
        while (!feof($fp)) { 
            $resp .= fgets($fp, 128); 
        } 
        fclose($fp); 
        // check status is 200 
        $status_regex = "/HTTP\/1\.\d\s(\d+)/"; 
        if(preg_match($status_regex, $resp, $matches) && $matches[1] == 200) {    
            // load xml as object 
            $parts = explode("\r\n\r\n", $resp);    
            return simplexml_load_string($parts[1]);                
        } 
    } 
    return false; 
}

php检查（如果节点存在）在xml feed中

2 个答案: