The mkdir function does not create a folder with permissions of 775 and 777, but creates 755 in both cases. What's the matter?

Question

PHP

Hello everyone, here is the code:

mkdir($_SERVER['DOCUMENT_ROOT'] . '/test/', 0777, true);

When executed, it creates a folder with a permission of 755, but it needs a permission of 777. Also, if you specify a resolution less than 700 in the function, then the permissions are set correctly. Please tell me how to solve it.

PHP 7.4
Ubuntu 18

Answer 1

$old_umask = umask(0);
mkdir($_SERVER['DOCUMENT_ROOT'] . '/test/', 0777, true);
umask($old_umask);

Answer 2

Why do you need such permissions? Read about it before setting such permissions.

Answer 3

you do not need to create 777, this indicates that you have an error with the rights. but this is not a reason to decide it in such an occasion.

Answer 4

man umask
I suspect that this is the case