请求上传接口出现异常 Fatalerror:Array and string offset access syntax with curlybracesis no longer supported in C:\xampp\htdocs\libs\PHPExcel\Shared\String.phponline526
查找问题原因：https://blog.csdn.net/weixin_41290949/article/details/104178756
解决方案:https://blog.csdn.net/weixin_45467142/article/details/105982739 lockdatav Done!
