.htaccess pretty URL's excluding index.php and adding trailing / to the end

Question

Ok, I've fought with it for hours. I have 3 different .htaccess scripts which do what I need, but I'm unable to mix them together.

1. Make a pretty url from (example.com/gallery.php -> example.com/gallery)

   Options +FollowSymLinks
   RewriteEngine On
   RewriteRule ^([a-zA-Z0-9]+)$ $1.php
   

2. The script from #1 though forwards example.com/index.php to example.com/index, so this code removes index.php so example.com/index.php -> example.com

   Options +FollowSymLinks -MultiViews
   # Turn mod_rewrite on
   RewriteEngine On
   RewriteBase /
   
   RewriteCond %{REQUEST_FILENAME} !-f
   RewriteCond %{REQUEST_FILENAME} !-d
   RewriteRule ^(.*)$ index.php?$1 [L,QSA]
   
   RewriteCond %{THE_REQUEST} ^[A-Z]{3,}\s(.*)/index\.php [NC]
   RewriteRule ^ /%1 [R=301,L]
   

3. The script should add a trailing slash so example.com/gallery -> example.com/gallery/

   # invoke rewrite engine
   RewriteEngine On
   RewriteBase /~new/
   
   # add trailing slash if missing
   rewriteRule ^(([a-z0-9\-]+/)*[a-z0-9\-]+)$ $1/ [NC,R=301,L]
   

Can someone help me to combine those 3 scripts into one universal pretty URL scripts

Answer 1

add these directives to .htaccess in the root directory of your website

Options +FollowSymLinks
RewriteEngine On

# add trailing slash

RewriteCond %{REQUEST_URI} !(/$|\.) 
RewriteRule (.*) %{REQUEST_URI}/ [R=301,L] 

# rewrite gallery/ to gallery.php

RewriteCond %{REQUEST_URI} /$
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)/$ $1.php [L]

# redirect example.com/index.php to example.com/

RewriteCond %{REQUEST_URI} index\.php$
RewriteRule ^(.*)index\.php$ /$1/ [R=301,L]