PHP:获取错误无法将MongoDB\BSON\ObjectId类型的对象用作数组？

打印值时，我收到错误，无法将类型为MongoDB\BSON\ObjectId的对象用作数组

这是我的打印数据

    stdClass Object
(
    [_id] => MongoDB\BSON\ObjectId Object
        (
            [oid] => 5f55f95815a8508e2deac8dd
        )

    [title] => Consumers to Gain as Telcos Cut Broadband Rates
    [summary] => Consumers are set to benefit from a broadband  
    [newsSources] => Array
        (
            [0] => stdClass Object
                (
                    [title] => Consumers to Gain as Telcos Cut Broadband Rates
                    [articleId] => 003a0593-f0c3-11ea-98d1-1418779a6e32
                    [link] => https://myimpact.in/clipj_admin.php?id=95c14189533fa7c87a8ce6752cae40f5
                    [type] => print
                    [source] => The Economic Times - Kolkata
                     
                )

            [1] => stdClass Object
                (
                    [title] => Data Plans Coming Much Cheaper with Telcos at War, Again
                    [articleId] => 3c4052f6-f0ac-11ea-959b-0068ebdc2fd0
                    [link] => https://myimpact.in/clipj_admin.php?id=95126ad546a574dd8233c2b0365d5f01
                    [type] => print
                    [source] => The Economic Times - Mumbai
                  
                )
 

我正在尝试从两个阵列访问[Source]

这是我的代码-

  foreach($cursor as $row){
                    //     echo"<pre>";
                  
                    //    print_r($row);
                  
                       foreach($row as $data) {
                        foreach($data['newsSources'][0] as $k) {
                              echo $k->source ;
                              
                        }
                 }
 }

foreach（$cursor作为$row）{
//回声“；
foreach($data->newsSources as $item)
    echo $item->source;

//打印（行）；
foreach（$行作为$数据）{
foreach（$data['newsources'][0]作为$k）{
echo$k->source；
}
}
}

$data

是一个对象。您需要使用箭头语法来访问属性