导出excel文件后，显示文件损坏

首先去百度了一番

有说

ob_end_clean();

又说

在

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

后加
    exit;

但是都没有用最后用文本文件打开发现内部有个warnning
Warning：date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone.

发现是时区的问题

最后加上

date_default_timezone_set("Asia/Shanghai"); 

解决