1 First, check whether the file has operation permission. This problem often appears in windows server 2003 or linux and other operating systems with limited permissions. To see if your file has executable permissions, the most important thing is to check whether the permissions of the data folder are open.

2. Then, check whether the common.inc.php file in the data folder has the output of the bom header, that is, whether the utf8 file has the signature. If you sign, it is likely to cause a blank login.

3. Save it in unsigned format, click Save As on the file, and add a unicode signature under the encoding format. If there is a check mark, delete it and click Save. That's all.

4. If it can't be displayed, check whether inc_safe_config.php under the safe folder under data is also in a signed format. If so, just change it to unsigned format according to the above method.

Matters needing attention

Permission is a problem that many people will ignore. If you encounter problems, first check whether the permissions are turned on.

When using ftp to operate background files, you will usually open them with Notepad, so that all utf8 files you have operated will become signed, because Notepad will add bom headers to you without permission. When you modify files in the future, you must download them and edit them with a non-windows text editor.