json_encode return integer values on windows and string on linux

I've this strange problem showing up lately. I'm currently developing on a Windows environment while deploying on a Linux server, I know that isn't ideal but I can't do much about it at this stage.

All I'm doing is getting the data from database and then returning a JSON response of the resulting array, but the result is different causing problem in my front-end app.

I'm getting this on windows:

{
    "id":40,
    "name":"test"
}

and this on Linux:

{
     "id":"40",
     "name":"test"
}

I'm actually using Laravel framework and so the syntax is simply this:

$user = User::find($id);
return Response::json($user->toArray());

Which behind the scene is doing this:

$this->data = json_encode($data);

So unluckily I don't have a hook where to set JSON_NUMERIC_CHECK option.

Before refactoring my code, is there a way to force JSON_NUMERIC_CHECK on all json_encode calls? I'm using the same database to fetch the data so I guess it could be a platform-related problem?

EDIT:

Further investigations made me think that the guilty may be the database drivers. If I dump the data on windows I'm getting this:

 array
      'id' => int 40
      'name' => string 'test' (length=4)

while on Linux it's:

array
     'id' => string '40' (length=2)
     'name' => string 'test' (length=4)