Graph API在Graph Explorer中显示Canvas项目，但PHP SDK不返回

Question

我通过PHP SDK（版本5.0.0）从页面检索帖子。 Feed中的第三篇文章是Canvas项目，由Graph Explorer返回： https://developers.facebook.com/tools/explorer/?method=GET&path=578588098993907%2Fposts%3Ffields%3Did%26limit%3D20&version=v2.8

画布物品： https://www.facebook.com/business/news/introducing-canvas 注意画布项目仅显示在移动设备上而不是桌面上 - 可能是相关的。

当我通过PHP SDK从页面检索最新帖子时，画布帖子被完全省略：

$request = $this->client->request('GET', 
                                  '/578588098993907/posts',
                                   array('limit' => 10, 'fields' => id));
$response = $this->client->getClient()->sendRequest($request);
$graphEdge = $response->getGraphEdge(); 
foreach ($graphEdge as $graphNode) {
    echo $graphNode->getField('id');
}

（代码简化）

给出：

578588098993907_578950888957628
578588098993907_578951082290942
578588098993907_578945485624835
578588098993907_578665362319514
578588098993907_578662648986452
578588098993907_578660458986671
578588098993907_578659585653425
578588098993907_578633098989407
578588098993907_578632585656125
578588098993907_578631848989532

结果中完全忽略了ID为578588098993907_578950478957669的画布帖子。