Package phpoffice/phpexcel is abandoned, you should avoid using it. Use phpoffice/phpspreadsheet instead

https://packagist.org/packages/phpoffice/phpspreadsheet

composer require phpoffice/phpspreadsheet

    //模板下载

    public function template_download()

    {

        $spreadsheet = new Spreadsheet();

        $worksheet = $spreadsheet->getActiveSheet();

        $worksheet->setTitle('导入模板');  //设置当前sheet的标题

        $worksheet->getStyle('A1:E1')->getFont()->setBold(true)->setName('Arial')->setSize();

        $worksheet->getStyle('B1')->getFont()->setBold(true);

        $worksheet->getDefaultColumnDimension()->setWidth();

        //设置第一栏的标题

        $worksheet->setCellValue('A1', '交易流水号');

        $worksheet->setCellValue('B1', '开户名');

        $worksheet->setCellValue('C1', '卡号');

        $worksheet->setCellValue('D1', '交易金额');

        $worksheet->setCellValue('E1', '交易时间');

        //默认填充数据

        $explame_data_list = array(

            array(

                'bank_deal_no' => '',

                'account_name' => '小明',

                'bank_card' => '',

                'deal_money' => '100.00',

                'deal_time' => date("Y-m-d H:i:s"),

            ),

        );

        //第二行起

        $baseRow = ; //数据从N-1行开始往下输出 这里是避免头信息被覆盖

        foreach ($explame_data_list as $k => $val) {

            $i = $k + $baseRow;

            $worksheet->setCellValue('A' . $i, $val['bank_deal_no']);

            $worksheet->setCellValue('B' . $i, $val['account_name']);

            $worksheet->setCellValue('C' . $i, $val['bank_card']);

            $worksheet->setCellValue('D' . $i, $val['deal_money']);

            $worksheet->setCellValue('E' . $i, $val['deal_time']);;

        }

        //处理 数字过大会进行科学计数法

        $worksheet->getStyle('A2')->getNumberFormat()->setFormatCode(\PhpOffice\PhpSpreadsheet\Style\NumberFormat::FORMAT_NUMBER);

        $worksheet->getStyle('C2')->getNumberFormat()->setFormatCode(\PhpOffice\PhpSpreadsheet\Style\NumberFormat::FORMAT_NUMBER);

        $this->downloadExcel($spreadsheet, '批量导入模板-合同表单选项', 'Xls');

    }

/*********************************************************************************************************************/

    //公共文件，用来传入xls并下载

    private function downloadExcel($spreadsheet, $filename, $format)

    {

        // $format只能为 Xlsx 或 Xls

        if ($format == 'Xlsx') {

            header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');

        } elseif ($format == 'Xls') {

            header('Content-Type: application/vnd.ms-excel');

        }

        header("Content-Disposition: attachment;filename="

            . $filename . date('Y-m-d') . '.' . strtolower($format));

        header('Cache-Control: max-age=0');

        $objWriter = IOFactory::createWriter($spreadsheet, $format);

        $objWriter->save('php://output');

        //通过php保存在本地的时候需要用到

        //$objWriter->save($dir.'/demo.xlsx');

        //以下为需要用到IE时候设置

        // If you're serving to IE 9, then the following may be needed

        //header('Cache-Control: max-age=1');

        // If you're serving to IE over SSL, then the following may be needed

        //header('Expires: Mon, 26 Jul 1997 05:00:00 GMT'); // Date in the past

        //header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT'); // always modified

        //header('Cache-Control: cache, must-revalidate'); // HTTP/1.1

        //header('Pragma: public'); // HTTP/1.0

        exit;

    }

    public function import(){

        header("content-type:text/html;charset=utf-8");

        //上传excel文件

        $files = request()->file();

        //将文件保存到public/uploads目录下面

        try {

            validate(['image'=>'fileSize:1048576|fileExt:xls'])

                ->check($files);

            $savename = [];

            foreach($files as $file){

                $savename[] = \think\facade\Filesystem::disk('public')->putFile( 'billfile', $file,'md5');

            }

        } catch (think\exception\ValidateException $e) {

            return json(['status' => '', 'message' => $e->getMessage()]);

        }

        //获取文件路径

        $filePath = ROOT_PATH().'/public/uploads/'.$savename[];

        $spreadsheet = IOFactory::load($filePath);

        $sheetData = $spreadsheet->getActiveSheet()->toArray(true, true, true, true,true);

        $row_num = count($sheetData);

        $now_time = time();

        $import_data = []; //数组形式获取表格数据

        for ($i = ; $i <= $row_num; $i++) {

            $bank_deal_no   = $sheetData[$i]['A'];

            $account_name   = $sheetData[$i]['B'];

            $bank_card      = $sheetData[$i]['C'];

            $deal_money     = $sheetData[$i]['D'];

            $deal_time      = $sheetData[$i]['E'];

            if(!empty($bank_deal_no)  &&  !empty($account_name) &&  !empty($bank_card) &&  !empty($deal_money)  &&  !empty($deal_time)  ){

                $import_data[$i]['bank_deal_no'] = $bank_deal_no;

                $import_data[$i]['account_name'] = $account_name;

                $import_data[$i]['bank_card'] = $bank_card;

                $import_data[$i]['deal_money'] = $deal_money;

                $import_data[$i]['deal_time']   = $deal_time;

                $import_data[$i]['create_time'] = $now_time;

                $import_data[$i]['update_time'] = $now_time;

            }

        }

        sort($import_data);

        if (empty($import_data)) {

            return json(['status' => '', 'message' => '数据解析失败']);

        }

        $total_num = count($import_data);

        if ($total_num > ) {

            return json(['status' => '', 'message' => '数据超出限制，最多100条']);

        }

        //校验是否重复:交易流水号

        $data_array = array_column($import_data, 'bank_deal_no');

        $data_ids = implode(',', $data_array);

        $result_data = Db::name('user_bank_bill')

            ->field('bank_deal_no')

            ->where('bank_deal_no', 'in', $data_ids)

            ->select()

            ->toArray();

        $error_message = '';

        if (!empty($result_data)) {

            $result_data_array = array_column($result_data, 'bank_deal_no');

            $result_data_ids = implode(',', $result_data_array);

            $error_message = '以下流水号有重复，已筛选出: '.$result_data_ids;

            foreach ($import_data as $key => $value) {

                if(in_array($value['bank_deal_no'],$result_data_array)){

                    unset($import_data[$key]);

                }

            }

        }

        if(!empty($import_data)){

             //将数据保存到数据库

            $res = Db::name('user_bank_bill')->insertAll($import_data);

            if ($res) {

                return json(['status' => '', 'message' => '操作成功','result'=>$error_message]);

            } else {

                return json(['status' => '', 'message' => '提交失败，请刷新重试']);

            }

        }

        return json(['status' => '', 'message' => '数据错误','result' => $error_message]);

    }