How to close access to folders and files from the .htaccess browser, but leave it for scripts and the server?

Question

PHP

There are several folders with subfolders on the server.
They contain scripts.
How can you block access to folders and files using the .htaccess file so that when you type the address in the browser it shows that such a file or folder does not exist on the server?
I would like not to produce configuration files in each folder, but to create a rule in the root of the site.
So far I have found such a code, but it also denies access for the server, in general it does not work.

<FilesMatch ~ "\.(php|htm|html|js)$">
  Order allow,deny
  Deny from all
</FilesMatch>

Answer 1

Not really understood a phrase "prohibits access and for the server". Clarify please.

Answer 2

Try using Directory instead of FilesMatch

Answer 3

Write a redirect of all requests to index.php in it, create a constant, and in your scripts check whether it exists (if not defined then 404) folders are closed either with an empty index.html or with the Options -Indexes htaccess.net.ru/doc/ rule htaccess/options.php