根據時間獲取時間段時間

 /**
  * Explain: 用於根據時間獲取時間段時間
  */
  public function start_end_time($time_tyupe_string, $time_string){
        switch ($time_tyupe_string) {
            case 'date':
                $firstday   = date('Y-m-d 00:00:00', strtotime($time_string));
                $lastday    = date('Y-m-d 23:59:59', strtotime($time_string));
                break;
            case 'month':
                $firstday   = date('Y-m-01 00:00:00', strtotime($time_string));
                $lastday    = date('Y-m-d 23:59:59', strtotime("$firstday +1 month -1 day"));
                break;
            case 'quarter':
                $firstday  = date('Y-m-d', strtotime($time_string['start_date'])).' 00:00:00';
                $lastday   = date('Y-m-d', strtotime($time_string['end_date'])).' 24:00:00';
                break;
            case 'years':
                $firstday   = date('Y-01-01 00:00:00', strtotime($time_string));
                $lastday    = date('Y-m-d 23:59:59', strtotime("$firstday +1 year -1 day"));
                break;
            default:
                break;
        }
        $return_time = [$firstday,$lastday];
        return $return_time;
    }