How to create virtual hosts with php?

Question

linux

Hello!
I am developing a file storage. And I want to register, after which a virtual host is created on the server.
For example:
User Vasya registered on the site -> the /www/vasya folder appears
And so that this user can only see his own folder, and log in via FTP.

Answer 1

Well, that's not the right approach for me. It would be more logical to use system functions to add FTP users for example. And for them, under a password, give files with Basic Auth.
And by the way, after such an addition (config editing), Apache restart is not needed, is it?
But rewrites are a more sensible suggestion and + give files through an access check in the script itself, i.e. you can't download the file directly from the web.
And we create ftp as a feature for the advanced.