.htaccess remove .php and force trailing slash - php

Question

I have files in my root folder. jobs.php, contact.php.
I want to be able to use .htaccess to remove the .php extension and force a trailing slash /. So that, www.domain.com/jobs/ and www.domain.com/contact/ goes to their respective pages.
Also, I want jobs.domain.com to point to www.domain.com/jobs/
<IfModule mod_rewrite.c>
Options +SymLinksIfOwnerMatch
RewriteEngine On
RewriteBase /
RewriteRule ^(rosquillos)/$ $1 [L,R=301,NC]
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}\.php -f
RewriteRule ^(.*)$ $1.php
</IfModule>
This is what I've got so far, and as much as I try. I can't seem to get it to work.
Any help would be awesome.
EDIT:
I would like to rephrase my question. The existing code removes the .php extensions for me, what I really only need right now is an additional rule that points the subdomain to the correct file: ie. jobs.domain.com points to jobs.php. I can live without the trailing slash.

Answer 1

Your condition:
RewriteCond %{REQUEST_FILENAME}\.php -f
will fail if your URL's end with a trailing slash. But if you only have jobs and contact then you'll just want:
RewriteEngine On
# add trailing slash and redirect browser
RewriteRule ^([^/]+)$ /$1/ [L,R=301]
RewriteRule ^([^/]+)/$ /$1.php [L]
# redirect direct access to php files:
RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /([^/]+)\.php
RewriteRule ^ /%1/ [L,R=301]
Oh and I forgot:
RewriteCond %{HTTP_HOST} !^www\. [NC]
RewriteCond %{HTTP_HOST} ^([^.]+)\.domain\.com$ [NC]
RewriteCond %{DOCUMENT_ROOT}/%1.php -f
RewriteRule ^ /%1.php [L]
Assuming that *.domain.com has the same document root as www.domain.com.