Publishing PHP within a post?

Sorry to bother you – is it possible to allow PHP code within a post body?

Simply because I’m trying to use the useful Page management system, but I’m really looking to republish an RSS feed on a Page within WP from another part of my site, but so far, I simply end up with PHP code published:
http://www.chronicles-network.com/features/1/madeline-howard/

Any suggestions on how to allow PHP within posts/pages?

Many thanks again for your consideration.