How To Make Files With No Extention Behave As PHP

At this moment I have the following files in my directory:

index.php
about.php
help.php

I'm using these lines in .htaccess to call the files using no extension.

RewriteCond %{REQUEST_FILENAME} !-d
R开发者_高级运维ewriteCond %{REQUEST_FILENAME}\.php -f
RewriteRule ^(.*)$ $1.php

So sitename.com/index works as sitename.com/index.php

But I want to remove extensions completely. My directory would then look like this:

index
about
help

How to modify .htaccess to read some of these files as PHP and leave others untouched?

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One possible solution would be to catch 404 errors.

You need to configure your web server to trigger a specific PHP page on error. That PHP page would then read the requested URL and include a file with the same name.

Here is some help to get started: onlamp.com

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You probably can't do it with htaccess alone. You'll need to set your webserver to treat no-extension files as php files, and i'm not sure it can be done at all.