如何在foreach循环中连接变量上的mongodb对象 - PHP？

I am having a foreach loop, inside that data is fetching from mongodb Here is a sample

foreach($result as $document)
    {
$response_object = $this->user_model->getdata($document['id']);
    }

$response_object holds the mongocursor object of last iteration in this example. I need make $response_object as object variable which has to concatenate the objects in foreach till iteration and store in $response_object.

And why do you need a variable when you can use an array?

$listOfResponses = array();

foreach($result as $document)
   array_push($listOfResponses, $this->user_model->getdata($document['id']));