Prevent PHP from parsing non-PHP files such as someFile.php.txt

I just installed phpdocumentor, but received strange errors. I finally tracked down the problem.

Phpdocumentor creates various files such as someFile.php.txt which contains PHP code, but aren't meant to be parsed. Turns out, my server is parsing them. I've also tested a file name called someFile.txt, and it isn't being parsed.

How do I prevent my PHP server from parsing files such as someFile.php.txt?

My server is PHP Version 5.4.20, Apache 2.2.15, and CentOS 6.4. My /etc/httpd/conf.d/php.conf file is as follows:

#
# PHP is an HTML-embedded scripting language which attempts to make it
# easy for developers to write dynamically generated webpages.
#
<IfModule prefork.c>
  LoadModule php5_module modules/libphp5.so
</IfModule>
<IfModule worker.c>
  LoadModule php5_module modules/libphp5-zts.so
</IfModule>

#
# Cause the PHP interpreter to handle files with a .php extension.
#
AddHandler php5-script .php
AddType text/html .php

#
# Add index.php to the list of files that will be served as directory
# indexes.
#
DirectoryIndex index.php

#
# Uncomment the following line to allow PHP to pretty-print .phps
# files as PHP source code:
#
#AddType application/x-httpd-php-source .phps