trailing slash from URL url for some php url only - php

Question

I want to rewrite some URLs with .php to trailing slash URLs. However, I don't want to rewrite all URLs.
My code:
RewriteEngine On
RewriteBase /
RewriteCond %{THE_REQUEST} ^GET\ /[^?\s]+\.php
RewriteRule (.*)\.php$ /$1/ [L,R=301]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} ^/(.+)/$
RewriteCond %{DOCUMENT_ROOT}/%1.php -f
RewriteRule ^(.*)/$ $1.php [L]
RewriteCond %{REQUEST_URI} !\.(php?|jpg|gif|png|css|js|html|json|xml|eot|svg|ttf|woff|woff2|zip|csv|xlsx|webp|txt|gz|rar)$
RewriteRule ^(.*)([^/])$ https://%{HTTP_HOST}/$1$2/ [L,R=301]
I want force slash on:
/about-us.php => /about-us/
/services.php => /services/
I don't need slash on:
/cart.php => /cart.php
/auth.php => /auth.php

Answer 1

You may use these rules in your site root .htaccess:
RewriteEngine On
RewriteBase /
RewriteCond %{THE_REQUEST} \s/+(about-us|services)(?:\.php)?[\s?] [NC]
RewriteRule ^ /%1/ [R=301,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_URI} !\.(php?|jpg|gif|png|css|js|html|json|xml|eot|svg|ttf|woff|woff2|zip|csv|xlsx|webp|txt|gz|rar)$ [NC]
RewriteRule [^/]$ %{REQUEST_URI}/ [L,R=301,NE]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}.php -f
RewriteRule ^(.+?)/?$ $1.php [L]
Make sure to use only these rules in root .htaccess and test from a new browser or command line curl.

Answer 2

You can use this to remove the trailing slash from your /cart and /auth URIs .
Put the following two rules right below RewriteBase line in your htaccess :
#remove the trailing slash
RewriteRule ^(cart|auth)/$ $1 [L,R]
#rewrite /cart and /auth to their original location
RewriteRule ^(cart|auth)$ $1.php [L]