YouTube API v3:如何从PlaylistItems中获取返回的404(找不到)错误

我知道我可以循环播放列表来比较Youtube上是否存在播放列表，但这是在打两个电话（下面的例子），因为我已经知道播放列表ID，所以我应该只能打一个电话。

两次打电话到YouTube循环播放列表（不是我想要的方式）：

# Playlist ID from URL
$playlist=$_GET['playlist'];
# Playlists from YoUtube
$playlists=$yt->PlaylistsListFeed();
# Loop through the playlists.
foreach($playlists as $playlist_feed)
{
    if($playlist_feed['id']==$playlist)
    {
        # This is a playlist
        $this->setIsPlaylist(TRUE);
        # Assign the Playlist Items to a variable.
        $video_search=$yt->PlaylistItems($playlist_feed['id']);
        break;
    }
}
# If $video_search is not set then playlist does not exist.
if(!isset($video_search))
{
    return $display='That playlist doesn't exist. Please choose another.';
}

我有单次调用的代码，但我不知道如果播放列表ID不存在，如何获得它返回的404错误（结果来自下面的YouTube）。

YouTube方法（PlaylistItems）:

/**
 * PlaylistItems
 *
 * Retrieves videos from a playlist.
 *
 * @param   int $playlist_id            The ID of the playlist.
 * @param   string $part                The part parameter specifies a comma-separated list of
 *                                          one or more playlistItem resource properties that the API
 *                                          response will include. The part names that you can include
 *                                          in the parameter value are id, snippet, and contentDetails.
 * @access  public
 */
public function PlaylistItems($playlist_id, $part='snippet')
{
    # Set the Database instance to a variable.
    $doc=Document::getInstance();
    try
    {
        # Bring $youtube_service into the scope
        global $youtube_service;
        $playlistsItems_optParams=array('maxResults' => 50, 'playlistId' => $playlist_id);
        $playlistsItems=$youtube_service->playlistItems->listPlaylistItems($part, $playlistsItems_optParams);
        $new_array=$this->rebuildArray($playlistsItems, TRUE);
        # Instantiate a new Utility object.
        $utility=new Utility();
        # Sort the playlist array by date.
        $items=$utility->sortByDate($new_array, 'publishedAt');
        return $items;
    }
    catch(Exception $e)
    {
        # Print Results (below)
        print_r($e); exit;
        if($e->getCode()==404)
        {
            $doc->setError('That playlist doesn't exist. Please choose another.');
        }
    }
} #==== End -- PlaylistItems

单次呼叫代码：

# Playlist ID from URL
$playlist=$_GET['playlist'];
# Assign the Playlist Items to a variable.
$video_search=$yt->PlaylistItems($playlist);

PlaylistItems方法返回

正如你所看到的，一切都是protected或private，那么我该怎么知道是否有错误呢？

如果您使用的是zend-googleapi库，那么很容易获得播放列表提要，并捕获谷歌在不存在时返回的任何错误。最简单的解决方案是获取帐户上所有播放列表的列表，然后循环查看播放列表id是否与您的id匹配，然后从那里获取播放列表条目。这样就不会出现任何错误或异常。但是，这就是打多个电话，而这正是你试图避免的。为了进行一次调用，您需要拥有播放列表提要url，然后进行一次呼叫并捕获异常。这些是我在使用YouTube播放列表时使用的几个功能的片段。

选项1:

$this->api = new Zend_Gdata_YouTube();
$this->api->setMajorProtocolVersion(2);
$feed = $this->api->retrieveAllEntriesForFeed($this->api->getPlaylistListFeed('default'));
$playlistEntry = $this->__getPlaylistEntryFromFeed($feed, $playlistID);
//do what you want with the playlist entry, like get the list of all the videos


function __getPlaylistEntryFromFeed($feed, $entryId) {
    foreach($feed as $entry) {
       if($entry->getPlaylistId()->text == $entryId) {
        return $entry;
       }
    }
}

选项2:

try {
   $playlistVideoFeed = $this->api->getPlaylistVideoFeed($playlistFeedUrl. '?v=2&start-index=1');
   //this returns a list of videos in the playlist that you can loop through. see example function below.
} catch (Zend_Gdata_App_Exception $e) {
   echo $e->getMessage();
}

function getPlaylistVideos($playlistFeedUrl, $start=1, $total=0, $videos = array()) {
        $playlistVideoFeed = $this->api->getPlaylistVideoFeed($playlistFeedUrl. '?v=2&start-index='.$start);
        foreach ($playlistVideoFeed as $videoEntry) {
            $videos[] = $this->getDataFromVideoEntry($videoEntry);
        }
        $count = count($playlistVideoFeed);
        if(count($videos) < $total && $count != 0) {
            $videos = $this->getPlaylistvideos($playlistFeedUrl, $start + ($count-1), $total, $videos);
        }
        return $videos;
    }

要取这些例子并将其与代码一起使用，您可以尝试如下所示：

# Playlist ID from URL
$playlist=$_GET['playlist'];
# Assign the Playlist Items to a variable.
$video_search;
try {
    $video_search = $yt->PlaylistItems($playlist);
} catch(Google_ServiceException $e) {
   //there was an error
   echo $e->getMessage();
}

希望能有所帮助。

我最终只是列出了YouTube上的视频并获取了它们的状态。这将作为cron脚本运行，每10分钟运行一次。

# Get new uploaded videos from the database.
$get_new_videos=$db->get_results('SELECT `id`, `file_name`, `api` FROM `'.DBPREFIX.'videos` WHERE `new` IS NULL');
# If there are new videos...
if($get_new_videos>0)
{
    # Loop through the new videos
    foreach($get_new_videos as $new_video)
    {
        # Decode the `api` field.
        $api_decoded=json_decode($new_video->api);
        # Get the YouTube Video ID.
        $video_yt_id=$api_decoded->youtube_id;
        if(isset($new_video->file_name))
        {
            # Set the path to the video on the server.
            $video_path='videos'.DS.$new_video->file_name;
        }
        $to=TO_USER;
        $reply_to=FROM_SERVER;
        $subject="Video status from ".DOMAIN_NAME;
        $body='';
        # Check the video status.
        $check_status=$yt->listVideos('status', array('id' => $video_yt_id));
        # Did YouTube return results?
        if(!empty($check_status['items']))
        {
            # Has the video been processed? Default is TRUE. will be changed to FALSE if the video still has "uploaded" status.
            $processed=TRUE;
            # Loop through the videos from YouTube.
            foreach($check_status['items'] as $status)
            {
                if($status['status']['uploadStatus']=="uploaded")
                {
                    # The video has not been processed yet so do not send an email.
                    $processed=FALSE;
                }
                # Check to see if the YouTube upload was a success.
                elseif($status['status']['uploadStatus']=="processed")
                {
                    # Tell the user the video was uploaded.
                    $body.='Your video has been uploaded to YouTube and can be viewed at http://'.FULL_DOMAIN.'media/videos/?video='.$new_video->id;
                }
                # Check if the uploaded video status is rejected.
                elseif($status['status']['uploadStatus']=="rejected")
                {
                    if(isset($new_video->file_name))
                    {
                        # Get the Upload class.
                        require_once MODULES.'Form'.DS.'Upload.php';
                        # Instantiate an Upload object.
                        $upload=new Upload($video_path);
                        # Delete video file from server.
                        $upload->deleteFile($video_path);
                        # Remove extention from filename.
                        $name_no_ext=substr($new_video->file_name, 0, strrpos($new_video->file_name, '.'));
                        # Delete the thumbnails from the server.
                        $upload->deleteFile(IMAGES_PATH.'videos'.DS.'original'.DS.$name_no_ext.'.jpg');
                        $upload->deleteFile(IMAGES_PATH.'videos'.DS.$name_no_ext.'*.jpg', TRUE);
                        # Delete rejected video from YouTube
                        $delete_response=$yt->deleteVideo($video_yt_id);
                    }
                    # Need to delete the entry from the database as well.
                    $db->query('DELETE FROM `'.DBPREFIX.'videos` WHERE `id` = '.$db->quote($new_video->id).' LIMIT 1');
                    # Check if the rejection status was a duplicate.
                    if($status['status']['rejectionReason']=="duplicate")
                    {
                        # Tell the user the video was a duplicate.
                        $body.='Your video was rejected because it was a duplicate video';
                    }
                }
            }
        }
        else
        {
            $body.='Your video was not found on YouTube';
            $processed=TRUE;
        }
        # Update database if the video has been "processed".
        if($processed===TRUE)
        {
            # Get the PHPMailer class.
            require_once MODULES.'Email'.DS.'Email.php';
            # Instantiate a new PHPMailer object.
            $mail=new Email();
            $mail->sendEmail($subject, $to, $body, $reply_to);
            # Set new videos to old.
            $db->query('UPDATE `'.DBPREFIX.'videos` SET `new` = 0 WHERE `id` = '.$db->quote($new_video->id).' LIMIT 1');
        }
    }
}

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