htaccess add trailing slash and force www with clean urls - php

Question

I'm using my htaccess file with mod_rewrite to create clean urls like this:
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . index.php [L]
</IfModule>
I would also like to force the site to have the 'www' subdomain and most importunately add a trailing slash if the url doesn't have one.
I am an absolute noob with mod_rewrite and I've tried accomplishing this on my own by combining other code I found on google (sad I know), but I always end up with a 500 error.
Here's the code I found for force www:
<IfModule mod_rewrite.c>
Options +FollowSymLinks
RewriteCond %{HTTP_HOST} ^www\.domain\.tld$ [NC]
RewriteRule ^(.*)$ http://domain.tld/$1 [R=301,L]
</IfModule>
Thanks for your help.

Answer 1

Try separating out the www and the trailing slash check. This is tested and hopefully working for you. You didn't say if you're running placing at domain root or in a subdirectory - usually good info when asking for help with htaccess.
RewriteEngine On
# Assuming you're running at domain root. Change to working directory if needed.
RewriteBase /
#
# www check
# If you're running in a subdirectory, then you'll need to add that in
# to the redirected url (http://www.mydomain.com/subdirectory/$1
RewriteCond %{HTTP_HOST} !^www\. [NC]
RewriteRule ^(.*)$ http://www.mydomain.com/$1 [R=301,L]
#
# Trailing slash check
# Don't fix direct file links
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_URI} !(.*)/$
RewriteRule ^(.*)$ $1/ [L,R=301]
#
# Finally, forward everything to your front-controller
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule .* index.php [QSA,L]
To debug, comment out the individual sections and see what is/isn't working.

Answer 2

Use this and forgot your problems ;)
<IfModule mod_rewrite.c>
Options +FollowSymLinks
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{HTTP_HOST} ^www\.(.*) [NC]
RewriteRule ^(.*?)/*$ http://%1/$1/ [L,R=301]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_URI} !(.*)/$
RewriteRule ^(.*)$ http://your-domain.ru/$1/ [L,R=301]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ /index.php/$1 [L]
</IfModule>