CODE EXAMPLE FOR PHP

Remove .php extension & Remove trailing slash

RewriteCond %{THE_REQUEST} ^.*/index.php
RewriteRule ^(.*)index.php$ /$1 [R=301,L]
RewriteCond %{THE_REQUEST} /([^.]+).php [NC]
RewriteRule ^ /%1 [R=301,NC,L,R]
RewriteRule ^(.*)/(?.*)?$ $1$2 [R=301,L]
RewriteCond %{REQUEST_FILENAME}.php -f
RewriteRule ^ %{REQUEST_URI}.php [NC,L]