How to modify file read and write permissions in php

In PHP, you can use the chmod() function to modify the file read and write permissions. The function of this function is to change the permissions of the specified file; the syntax format is "chmod(file,mode)", and the parameter file specifies the Check the file, the parameter mode specifies new permissions.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php changes the read and write permissions of the file

Related function description:

chmod() function changes the permissions of the specified file. Returns TRUE if successful, FALSE if failed.

Syntax

chmod(file,mode)

chmod will try to change the mode of the file specified by file to that given by mode.

Note: mode will not be automatically treated as an octal value, and strings (such as "g w") cannot be used. To ensure correct operation, you need to add 0 in front of the mode:

The mode parameter contains three octal numbers in order to specify the owner, the owner's group, and everyone's access restrictions. Each part can be calculated by adding the required permissions. The number 1 makes the file executable, the number 2 makes the file writable, and the number 4 makes the file readable. Add these numbers to specify the required permissions.

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