How to set file permissions in php

The way to set file permissions in php is:

Use the chmod function
The mode parameter contains three octal numbers, which are specified in order. The owner, the owner's group, and access restrictions for everyone. 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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