public function subAnalysis()
{
$sub_months = array();
for ($i = 4; $i >= 0; $i--) {
$this_mon = Carbon::now()->month - $i;
$data = Subscriber::whereMonth('created_at', '<=', $this_mon)->count();
$this_mon_name = date("F", mktime(0, 0, 0, $this_mon, 10));
array_push($sub_months, array('label' => $this_mon_name, 'value' => $data));
}
$result = array('past_months' => $sub_months);
return Response::json($result)->setCallback(Input::get('callback'));
}