Slashes at the end

I found some stuff on some other sites, but didn't work.

Also i have this to remove .php extension

RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}\.php -f
RewriteRule ^(.*)$ $1.php

Now, I want to add slashes at the end. Can someone give me the right code?

Use:

RewriteCond %{REQUEST_URI} !(.*)/$

RewriteRule ^(.*)$ http://your-site.com/$1 [R=301,L]

Make sure the above code is before:

RewriteCond %{REQUEST_FILENAME} !-d

RewriteCond %{REQUEST_FILENAME}\.php -f

RewriteRule ^(.*)$ $1.php