PhpSpreadsheet 导出Excel

getActiveSheet();
        $cellNum = count($expCellName);
        $dataNum = count($expTableData);
        $cellName = array('A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'AA', 'AB', 'AC', 'AD', 'AE', 'AF', 'AG', 'AH', 'AI', 'AJ', 'AK', 'AL', 'AM', 'AN', 'AO', 'AP', 'AQ', 'AR', 'AS', 'AT', 'AU', 'AV', 'AW', 'AX', 'AY', 'AZ');

        // 合并单元格
        $worksheet->mergeCells('A1:'.$cellName[$cellNum - 1] . '1');
        // 设置第一格的内容
        $worksheet->setCellValue('A1', $expTitle);
        // 设置加粗
        $worksheet->getStyle('A1')->getFont()->setBold(true);
        // 设置居中
        $styleArray = [
            'alignment' => [
                'horizontal' => Alignment::HORIZONTAL_CENTER,
            ],
        ];
        $worksheet->getStyle('A1')->applyFromArray($styleArray);
        // 设置颜色
        $worksheet->getStyle('A1')->getFont()->getColor()->setARGB(Color::COLOR_DARKRED);

        // 设置标题
        $worksheet->setTitle($expTitle);

        // 设置表格菜单
        for ($i = 0; $i < $cellNum; $i++) {
            $worksheet->setCellValue($cellName[$i] . (+2), $expCellName[$i][1]);
            $worksheet->getStyle($cellName[$i] . (+2))->getFont()->setBold(true);
            // 自动宽度
            $worksheet->getColumnDimension($cellName[$i])->setAutoSize(true);
        }

        // 设置表格内容
        for ($i = 0; $i < $dataNum; $i++) {
            for ($j = 0; $j < $cellNum; $j++) {
                $worksheet->setCellValue($cellName[$j] . ($i + 3), $expTableData[$i][$expCellName[$j][0]]);
                // 支持换行
                if ($expCellName[$j][2] == 1) {
                    $worksheet->getStyle($cellName[$j] . ($i + 3))->getAlignment()->setWrapText(true);
                }
            }
        }

        // 设置列宽为自动
        // $spreadsheet->getActiveSheet()->getDefaultColumnDimension()->setWidth(20);
        // $worksheet->getDefaultColumnDimension()->setAutoSize(true);

        // 设置行高
        $worksheet->getDefaultRowDimension()->setRowHeight(20);

        header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');//告诉浏览器输出07Excel文件
        //header('Content-Type:application/vnd.ms-excel');//告诉浏览器将要输出Excel03版本文件
        header('Content-Disposition: attachment;filename="'.$fileName.'.xlsx"');//告诉浏览器输出浏览器名称
        header('Cache-Control: max-age=0');//禁止缓存
        $writer = new Xlsx($spreadsheet);
        $writer->save('php://output');
    }
}