RewriteCond subdirectory is not working - php

Question

I am trying to do RewriteRule for subdirectory and I could not do it.
This is the code:
RewriteCond %{REQUEST_URI} !^/subfolder
RewriteCond %{DOCUMENT_ROOT}/subfolder%{REQUEST_URI} !-f
I use the following code with the above as well to remove the .php extension and add a trailing slash at the end.
RewriteRule ^([^/]+)/$ $1.php
RewriteRule ^([^/]+)/([^/]+)/$ /$1/$2.php
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} !(\.[a-zA-Z0-9]{1,5}|/)$
RewriteRule (.*)$ /$1/ [R=301,L]
I can access any page except index.php
I need someone to help me fix this issue so I can access the pages/files in the subdirectory.
Thank you

Answer 1

You need to explicitly check if the php file exists before you add the .php extension. And remember that rewrite conditions only apply to the immediately following rule, so you need to duplicate them if they need to apply to multiple rules. Also, you want all your redirects to happen before any routing or rewrites:
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} !(\.[a-zA-Z0-9]{1,5}|/)$
RewriteRule (.*)$ /$1/ [R=301,L]
RewriteCond %{DOCUMENT_ROOT}/$1.php -f
RewriteRule ^([^/]+)/$ $1.php [L]
RewriteCond %{DOCUMENT_ROOT}/$1/$2.php -f
RewriteRule ^([^/]+)/([^/]+)/$ /$1/$2.php
# whatever subfolder rewrites you need can go here