PHP create password protected folders

I would like to know if there is a way in PHP to create a password protected folder on the fly.

I need to create a specific INSIDE folder in the main folder and password in order to protect the new folder with the password selected by the user.

Is there a way for PHP to achieve something like this?

Thank!

Oh, and this folder should not be accessible from the Internet, and no one, EVEN, the server administrator can open it without a password.

I know this sounds like crazy, but this is for the copyright service, a serious thing.

How do I know