How are such FTP storages made?

Question

PHP

www.mmnt.net/db/0/0/ftp.asus.com/pub/ASUS
Actually, how to do it? In which direction to dig?
It is necessary that when adding a site via FTP, the files immediately appear on the page.
And it would be desirable so that the page could be styled.
For example, I'm especially interested in having an input text field next to the file that contains a link to the file.
To make it easy to copy. Or copied in some other way.

Answer 1

filemanager.veno.it
https://github.com/jcampbell1/simple-file-manager
tomicki.net/dir.php