mod_rewrite - Change Folder to Filename [closed] - regex

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I'm searching for a RewriteRule or Condition to make this happen:
www.example.com/a/ to a.php
www.example.com/a/b/ to a,b.php
www.example.com/a/b/c/ to a,b,c.php
...
I had this Rules:
RewriteRule ^(.+)/(.+)/(.+)/$ ./$1,$2,$3.php [L]
RewriteRule ^(.+)/(.+)/$ ./$1,$2.php [L]
RewriteRule ^(.+)/$ ./$1.php [L]
That worked for a,b and a,b,c:
www.example.com/products/room/ to products,room.php
www.example.com/products/room/chair/ to products,room,chair.php
but not for a:
www.example.com/products/ to products.php
Can anyone help me out?
EDIT:
I figured out that this is a problem with the synology diskstation apache configuration.
I checked my code, and the code of anubhava on another server and it worked fine.

Answer 1

Very strange filenames I must say that.
Anyway try this code in your DOCUMENT_ROOT/.htaccess file:
RewriteEngine On
## If the request is for a valid directory
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteCond %{DOCUMENT_ROOT}/$1.php -f
RewriteRule ^([^/]+)/?$ /$1.php [L]
RewriteRule ^([^/]+)/([^/]+)/?$ /$1,$2.php [L]
RewriteRule ^([^/]+)/([^/]+)/([^/]+)/?$ /$1,$2,$3.php [L]