PbootCMS附件上传失败报错UNKNOW: Code: 8192; Desc: stripos(): Non-string needles will be interpreted as strings in the future.

PbootCMS附件上传时报错：

上传失败：UNKNOW: Code: 8192; Desc: stripos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior; File: /www/wwwroot/aaa.xxxx.com/core/function/file.php; Line: 176;

翻译过来就是字符串错误：上传失败：未知：代码：8192；描述：stripos（）：非字符串指针将来将被解释为字符串。使用显式的chr（）调用来保留当前行为；文件：/www/wwwroot/aa.xxx.com/core/function/File.php；线路：176；

解决办法：

打开/core/function/file.php，搜索以下

if (stripos($types, $ext) !== false)

替换成

if (stripos($types, chr($ext)) !== false)