Parse a mongodb document

[Souzanne]

I am a MongoDB beginner.
I want to parse a mongodb document using PHP.
But I get this error:

Notice: Undefined property: MongoId::$created_at 

This is a part of my document:

{"_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}

And This my PHP code:

$cursor = (object)$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);

[Jeremy Mikola]

If I understand correctly, your document has three top-level fields:

• "_id", which contains an ObjectId (i.e. MongoId class in PHP)
• "0", which contains two fields
• "created_at", a date string
  
• "id": a large floating point number
  
• "1", which also contains the same two fields as "0"
  

In your code example, you're attempting to access a top-level "created_at" field, which doesn't exist.

Generally, "0" and "1" are odd choices for top-level field names. Since you're using PHP, I'm assuming this document resulted from inserting a PHP array, which had sequential, numeric keys. The driver added the "_id" field, but left "0" and "1" in place. Did you expect those embedded documents to be documents in their own right?

Also note that although PHP uses a single array type for lists/vectors and dictionaries/hashes, BSON actually has distinct array and object types (like JSON).

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