Question

我是MongoDB的初学者。
我想解析一个mongodb文件。
但是我收到了这个错误：

Notice: Undefined property: MongoId::$created_at

{"_id":{"$id":"554351e5fd2897ac42000029"},
"0":{"created_at":"Thu Apr 30 12:25:12 +0000 2015",
"id":5.9375296462128e+17},
"1":{"created_at":"Thu Apr 30 12:25:12 +0000 2015",
"id":5.93277777128e+17}

这是我的PHP代码：

$cursor = (object)$collection->findOne( $query );
    $l = 0;
    foreach ($cursor as $twt) {
      $twt = (object) $twt;
        $test[$l] = (object)(
       $twt->created_at
        );
        $l = $l +1; }

     echo json_encode($test);`

Answer 1

您的对象数据结构有点奇怪，看起来您有一个“0”和一个“1”键。您的createdat属性位于“0”键内。尝试展平您的对象，使createdat属性位于顶层，与_id相同

Answer 2

这对我有用。

$cursor =$collection->findOne( $query );
    unset($cursor["_id"]);
    $cursor= (object)$cursor;
$l = 0;
    foreach ($cursor as $twt) {
        $twts = (object) $twt;
        $test[$l] = (object)(
       $twts->created_at
        );
    $l = $l +1; }

注意：未定义的属性：MongoId

2 个答案: