Replace php extension with slash / using .htaccess - regex

Question

I want to rewrite php extensions with .htaccess. I want to replace php extension with slash / . For example If I have: http://example.com/about-us.php will be http://example.com/about-us/
How can I make this modifying this piece of code:
Options +FollowSymLinks -MultiViews
# Turn mod_rewrite on
RewriteEngine On
RewriteBase /
# To externally redirect /dir/foo.php to /dir/foo
RewriteCond %{THE_REQUEST} ^[A-Z]{3,}\s([^.]+)\.php [NC]
RewriteRule ^ %1 [R,L,NC]
## To internally redirect /dir/foo to /dir/foo.php
RewriteCond %{REQUEST_FILENAME}.php -f [NC]
RewriteRule ^ %{REQUEST_URI}.php [L]
RewriteRule .*[^/]$ $0/ [L,R=301]
Thanks to all!!!

Answer 1

You can use:
Options +FollowSymLinks -MultiViews
RewriteEngine On
RewriteBase /
# To externally redirect /dir/foo.php to /dir/foo
RewriteCond %{THE_REQUEST} ^[A-Z]{3,}\s([^.]+)\.php [NC]
RewriteRule ^ %1/ [R,L]
## To internally redirect /dir/foo to /dir/foo.php
RewriteCond %{REQUEST_FILENAME}.php -f [NC]
RewriteRule ^(.+?)/?$ $1.php [L]

Answer 2

Tested with Apache 2.2 and Apache 1.3.7
RewriteEngine On
RewriteBase /
You can do it with one line
RewriteRule ^(.*)/$ /$1.php [L]
Apache 2.2
for http://www.domain.com/services.php
and get it with
http://www.domain.com/services OR http://www.domain.com/services/
Apache 1.3.7
if you want
http://www.domain.com/services/
you need ..//$
RewriteRule ^(.*)//$ /$1.php [L]
Update
http.conf
LoadModule rewrite_module modules/mod_rewrite.so
possible false options : must have MultiViews
DocumentRoot
<Directory "G:\Programme\Apache Group\Apache\htdocs">
Options Indexes MultiViews
AllowOverride None
Order allow,deny
Allow from all
</Directory>

Answer 3

In html head, include:
<base href="http://www.yourdomain.com/">
In htacces:
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}\.php -f [NC]
RewriteRule ^(.+?)/?$ $1.php
RewriteCond %{REQUEST_URI} !\.[^./]+$
RewriteCond %{REQUEST_URI} !(.*)/$
RewriteRule ^(.*)\.[^.]+$ http://www.yourdomain.com/$1/ [L,R=301]
It's worked to me. Good luck!