Ошибка цикла Laravel 5.3

Привет, я пытаюсь зациклить календарные месяцы и годы, но мой цикл останавливается на самой первой итерации в индексной функции. Можете ли вы мне помочь?

Функция индекса:

public function index()
{
$users = DB::table('users')->where('roles_id', '2')->get();

  date_default_timezone_set("Asia/Hong_Kong");

  for ($iterateYear = 2017; $iterateYear < 2018; $iterateYear++) {
    for ($iterateMonth = 1; $iterateMonth <= 12; $iterateMonth++) {

      /* Set the date */
      $date = strtotime(sprintf('%s-%s-01', $iterateYear, $iterateMonth));
      return $this->renderCalenderMonth($date);

    }
  }

    return view('transaction.index', [
      'users' => $users
    ]);
}

Функция RenderCalendarMonth:

публичная функция renderCalenderMonth($date) {

  // $date = strtotime(date("Y-m-d"));
  $NUMBER_OF_COLUMNS = 37;

  $day = date('d', $date);
  $month = date('m', $date);
  $year = date('Y', $date);

  $firstDay = mktime(0,0,0,$month, 1, $year);
  $title = strftime('%B', $firstDay);
  $dayOfWeek = date('D', $firstDay);
  $daysInMonth = cal_days_in_month(0, $month, $year);
  /* Get the name of the week days */
  $timestamp = strtotime('next Sunday');
  $weekDays = [];

  for($i = 0; $i < $NUMBER_OF_COLUMNS; $i++) {
      $weekDays[] = strftime('%a', $timestamp);
      $timestamp = strtotime('+1 day', $timestamp);
  }
  $blank = date('w', strtotime("{$year}-{$month}-01"));

  $divid = $title.$year;

  return view('transaction.index', [
    'date' => $date,
    'day' => $day,
    'month' => $month,
    'year' => $year,
    'firstDay' => $firstDay,
    'title' => $title,
    'dayOfWeek' => $dayOfWeek,
    'daysInMonth' => $daysInMonth,
    'timestamp' => $timestamp,
    'weekDays' => $weekDays,
    'blank' => $blank,
    'divid' => $divid,
    'NUMBER_OF_COLUMNS' => $NUMBER_OF_COLUMNS
  ]);

}