How to get a list of files in a directory and rename one of them?

Question

MySQL

There are files in the directory, you need to make it possible for the user to re-upload them, but leave the old version.
To do this, I want to add something (file-name__old.jpg) to the old file, save a new file (file-name.jpg) and save the whole thing in the database.
But so far it's not even possible to get a list of all files from the directory

Answer 1

$files = FileHelper::findFiles($dir);
The rest means PHP.

Answer 2

The list of files can be obtained through RecursiveDirectoryIterator