thinkphp - PHPExcel導出

/*導出記錄*/
function actionExcelSign2(){
    header('Content-Type:text/html; charset=utf-8');
    $signM = M("model");
    // 查詢
    $rows = $signM->select();
    Vendor('PHPExcel.PHPExcel');
    //建立對象
    $objPHPExcel = new \PHPExcel();
    //設置屬性
    $objPHPExcel->getProperties()
        ->setCreator("WOLF")
        ->setLastModifiedBy("WOLF")
        ->setTitle("Office 2007 XLSX Test Document")
        ->setSubject("Office 2007 XLSX Test Document")
        ->setDescription("Test document for Office 2007 XLSX, generated using PHP classes.");
    //垂直居中
    $objPHPExcel->getActiveSheet()->getStyle('A18')->getAlignment()->setVertical(\PHPExcel_Style_Alignment::VERTICAL_CENTER);
    //自動填充到頁面的寬度
    $objPHPExcel->getActiveSheet()->getPageSetup()->setFitToWidth('20');
    //填充表格
    $objActSheet = $objPHPExcel->setActiveSheetIndex(0); //填充表頭
    $objActSheet->setCellValue('B1','用戶');
    $objActSheet->setCellValue('C1','訂單號');
    $objActSheet->setCellValue('D1','收貨人省份證');
    $objActSheet->setCellValue('E1','商品名稱');
    //填充內容
    for($i=0; $i<count($rows); $i++){
        $key = $i+2;
        $objActSheet->setCellValue('B'.$key, $rows[$i]['user_id']);
        $objActSheet->setCellValue('C'.$key, $rows[$i]['order_no'].' ');
        $objActSheet->setCellValue('D'.$key, $rows[$i]['cardno'].' ');
        $objActSheet->setCellValue('E'.$key, $rows[$i]['productname']);
    }
    //輸出
    $objPHPExcel->getActiveSheet()->setTitle('訂單列表');
    $objPHPExcel->setActiveSheetIndex(0);
    $day      = date("m-d");
    $filename = '訂單列表.xls';
    ob_end_clean();//清除緩衝區,避免亂碼
    header("Content-Type: application/vnd.ms-excel; charset=utf-8");
    header('Content-Disposition: attachment;filename='.$filename);
    header('Cache-Control: max-age=0');
    $objWriter = \PHPExcel_IOFactory::createWriter($objPHPExcel,'Excel5');

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