I know this has been discussed many times but I need to ask...

I have
RewriteRule ^(.*)\/$ $1.php [nc]

Which works if you type in www.sitename.com/page/

However you can still type in www.sitename.com/page.php

What is the string so that even if a .php is typed in it redirects you to without an ext or just gives you an error page?

RewriteRule /page.php /page/ [R=301,L] and add L to nc in your square brackets

Will I have to write that for ever single page?

You can use wildcards like you did in your original rewrite rule. Just follow mtishetsky's structure.

RewriteRule /(.*).php /$1/ [R=301, L]

The all encompassing (.*) may not be the one you ideally want, depending on your URLs.

By using either of those configurations, and also adding L to the NC, I get a 500 internal server error.

Here is what I have...

RewriteRule ^(.*)\$ $1.php [nc,L]
RewriteRule /(.*).php /$1/ [R=301,L]

Any ideas?

Try this. You should only need the one line.

RedirectMatch 301 /(.*).php http://www.yourdomain.com/$1/

That just gives me a 404 error. Forbidden. And changes all the URL's to http://www.site .com/profile/?user=profile

Could you provide two exact URLs and old one and where you want it to point to?

Also what else do you have in your .htaccess file. It's possible you have other rules that are causing conflicts.

I think you are correct. I am going to send it to you.