用phpexcel插件导出excel2003

1 ob_end_clean();//清空缓冲区并关闭输出缓冲（清除脏数据）。
2 header('Content-Type:application/vnd.ms-execel');
3 header('Content-Disposition:attachment;filename="monitor_export_case.xls"');
4 $objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel5');
5 $objWriter->save('php://output');

 ob是output buffering的意思 也就是程序输出缓存