Laravel的回应很大

I'm sending this response:

$item_collections = array('@type' => 'http://activitystrea.ms/2.0/Collection',
                                     'objectID' => $stream_collections->objectID,
                                     'owner' => array('globalID'=>$stream_collections->owner),
                                     'items'=>array());

foreach($stream_collections->streamitem as $Item){

    $items = array('item'=>array(
                   'objectID' =>  $Item->objectID,
                   'targetID' => $Item->targetID,
                   'owner' =>$Item->owner,
                   'author' => array($Item->author),
                   '@type' => 'Post',
                   'published' => $Item->published,
                   'actor' => array('@type'=>'Person',
                   'displayName'=>$Item->person->displayName),
                   'object' => array('@type'=>'Note',
                       'displayName'=>$Item->text)),
                   'comments'=>$Item->comment,
                   'likes'=>$Item->like,
                   'tags'=>array(),
    );

    array_push($item_collections['items'], $items);
} return response($item_collections)

so if the $Item->comment or $Item->like has more than 6 comments or likes the body of the response will have some extra break lines, letters and numbers.

On the client side I'm trying to get the body using:

list($header, $body) = explode("

", $response, 2);

When i print the $body I get the extra break lines and letters like this:

9201
{\"@type\":\".........}
0

I don't know where 9201 and 0 came from. If the response is not large everything will work fine! Does anyone have an idea why this happens?