php file permission settings

File permission setting functions are commonly used in system management level software. For example: a certain file is not allowed to be viewed by the guest group (guest users).

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 about 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.

It is relatively easy for students who have learned Linux. Those who have not learned it will find it a little difficult.

<?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); 
?>