How to avoid running php files using htaccess?

[eluser]borisoff[/eluser]
To do this I write in every php file(controllers, views, etc.)

Code:

if (!defined('BASEPATH')) exit('No direct script access allowed');

But sometimes I forget to write it. Is there a way to protect php files from executing using only htaccess file? I know that I can move my files in a different, not visible directory but this is not possible right now.