日期范围

        switch ($date_type){
            case    'yesterday':

                $res_data = [
                    'start_time'  =>      strtotime(date('Y-m-d',time())) - 24 * 3600,
                    'end_time'    =>      strtotime(date('Y-m-d',time()))
                ];

                break;
            case    'today':
                $res_data = [
                    'start_time'  =>      strtotime(date('Y-m-d',time())),
                    'end_time'    =>      time()
                ];

                break;
            case    'all_days':       // 所有时间范围内!!!

                $res_data = [
                    'start_time'  =>      strtotime('2019-01-01'),
                    'end_time'    =>      time()
                ];

                break;
            case    'this_mouth':

                $res_data = [
                    'start_time'  =>      strtotime(date('Y-m-01',time())),
                    'end_time'    =>      time()
                ];

                break;
            case    'this_year':

                $res_data = [
                    'start_time'  =>      strtotime(date('Y-01-01',time())),
                    'end_time'    =>      time()
                ];

                break;
            default     :
                $res_data = [
                    'start_time'  =>      0,
                    'end_time'    =>      0
                ];
                break;

        }