Edit files (i.e. change file name) through custom page options?

Hey,
I was wondering if it could be possible to create a function for the custom admin page, that allows the user to write i.e. 99, and use this number to edit a file’s name i.e. single-99.php

So by writing 99, the user told the function to add that number to single- so that it turns out single-99.php. Any ideas if this could be possible?

Thanks!

There is a solution to rename files with PHP :

<?php rename("old_test.php","new_text.php");
?>

And this is the syntax:

<?php rename("OLD FILE NAME","NEW FILE NAME");
?>