File permission settings

In enterprise management, certain users or certain user files are only allowed to be read and not modified. These are very commonly used functions.

Note:

1. This chapter is an understanding chapter. If you have not learned Linux before and it will be a bit difficult, you can skip this chapter and learn about it.

2. It is less useful in actual production processes.

3. Mainly for students who have a comprehensive knowledge system under Linux and can focus on learning.

4. Some functions under windows cannot be implemented.

The above function usage and Linux permissions The usage is the same.
It is relatively easy for students who have learned Linux. Those who have not learned it will find it a little difficult.

I will only give you an example to see how to modify permissions:

chmod mainly modifies the permissions of files

<?php
//修改linux  系统/var/wwwroot/某文件权限为755
chmod("/var/wwwroot/index.html", 755); 
chmod("/var/wwwroot/index.html", "u+rwx,go+rx");
chmod("/somedir/somefile", 0755);
?>