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;
打开/core/function/file.php，搜索以下
if (stripos($types, $ext) !== false)
替换成
if (stripos($types, chr($ext)) !== false)
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