[url rewrite] Shortest code for removing www and file extension, and forcing slash at the end?

I had made my .htaccess to remove www, remove file extension and force slash at the end. The code now looks like:

RewriteEngine on
RewriteBase /

RewriteCond %{HTTP_HOST} ^www\.(.+) [NC]
RewriteRule ^ http://%1%{REQUEST_URI} [NE,L,R=301]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} !(\.[a-zA-Z0-9]{1,5}|/)$
RewriteRule (.*)$ /$1/ [L,R=301]

RewriteCond %{DOCUMENT_ROOT}/$1.php -f
RewriteRule ^([^/]+)/$ $1.php [L]

RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /([^/]+)\.php
RewriteRule ^ /%1/ [L,R=301]

Code (ApacheConf):

It is working as expected. But because the code actually consists of different pieces I obtained from multiple sources, I'm not sure if it is doing something redundant such as unnecessary redirections.

Any advice would be mush appreciated.