Is it possible to deny access to everything except one file in .htaccess?

Question

Apache HTTP Server

The site has a folder /folder/
It has a file index.php , .htaccess and a few more folders such as /folder/folder2/
It has the following lines

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /folder/index.php [L]

DirectoryIndex index.php

How can I add a file so that access is only to index.php?

Answer 1

rewrite cond request uri !url