How to modify excel in php

//模板存放目录

            $dir = $DOCUMENT_ROOT.'/backoffice/admin/oemcheck/';

             

             

            $templateName = '1.xlsx';

            $outputFileName = '模板.xlsx';

            $txt='test';

             

            //实例化Excel读取类

            $PHPReader = new PHPExcel_Reader_Excel2007();

            if(!$PHPReader->canRead($dir.$templateName)){

             $PHPReader = new PHPExcel_Reader_Excel5();

             if(!$PHPReader->canRead($dir.$templateName)){

              echo '无法识别的Excel文件！';

              return false;

             }

            }

            //读取Excel

            $PHPExcel = $PHPReader->load($dir.$templateName);

            //读取工作表1

            $currentSheet = $PHPExcel->getSheet(0);

             

            $currentSheet->setCellValue('B13',iconv('gbk','utf-8',$txt));//表头赋值//

            //实例化Excel写入类

            $PHPWriter = new PHPExcel_Writer_Excel2007($PHPExcel);

            ob_start();

            header("Content-Type: application/force-download");

            header("Content-Type: application/octet-stream");

            header("Content-Type: application/download");

            header('Content-Disposition:attachment;filename="' .$outputFileName. '"');//输出模板名称

            header("Content-Transfer-Encoding: binary");

            header("Last-Modified:".gmdate("D, d M Y H:i:s")." GMT");

            header('Pragma: public');

            header('Expires: 30');

            header('Cache-Control: public');

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