How to set file permissions in php

In PHP, you can set file permissions through the "chmod" function. This function is used to change the file mode. The syntax is "chmod(file,mode)", where the parameter "file" represents the file to be checked. The parameter "mode" specifies the new permissions.

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chmod() function changes the file mode.

Returns TRUE if successful, otherwise returns FALSE.

Syntax

chmod(file,mode)

Parameters

file required. Specifies the documents to be checked.

mode

Optional. Specify new permissions.

The mode parameter consists of 4 numbers:

The first number is always 0

The second number specifies the owner's permissions

The second The first number specifies the permissions of the user group to which the owner belongs

The fourth number specifies the permissions of everyone else

Possible values ​​(if you need to set multiple permissions, please adjust the numbers below Total):

1 - Execute permission

2 - Write permission

4 - Read permission

Example

<?php
// 所有者可读写，其他人没有任何权限
chmod("test.txt",0600);
// 所有者可读写，其他人可读
chmod("test.txt",0644);
// 所有者有所有权限，其他所有人可读和执行
chmod("test.txt",0755);
// 所有者有所有权限，所有者所在的组可读
chmod("test.txt",0740);
?>

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