best way to add root to json?

[dadamssg]

I see there is an XmlRoot option for xml, what's the easiest way to do this for json?

Rather than this

{
    "id": 12,
    "name": "Billy Bob"
}

I'd like to get

{
    "user": {
        "id": 12,
        "name": "Billy Bob"
    }
}

The only way i can think to accomplish this is to json_decode it, add it to a stdClass and then json_encode it back again:

<?php
    $json = json_decode($this->get('jms_serializer')->serialize($user, 'json'));
    $obj = new \stdClass;
    $obj->user = $json;
    $json = json_encode($obj);

There's got to be an easier way.

[henrikbjorn]

Create a wrapper that is then serialized.

[dadamssg]

then i would have to create wrapper classes for each object i would want to return.

[stof]

$json = $this->get('jms_serializer')->serialize(array('user' => $user), 'json');

[Actine]

+1. It would be great if the root element for JSON could be declared via annotation. There's little charm to do this explicitly with every response.
The problem I'm concerned about is a JSON Array hack.