Ok. When you rightclick a page and select VIEW SOURCE you usually see HTML, basically just stuff that makes up a page. Now, pages can be either static or dynamic. Static means the webserver just holds HTML files which are sent to you and displayed in your browser. Nothing special going on there.
Dynamic means the page is compiled/interpreted and the result (in HTML) is send to you. So basically the webserver holds programming code and whenever you request a page, the server executes the code and sends you the result.
The fail here is that they use PHP code, but didn't configure the webserver properly. So the bare programmingcode is visible in the source instead of the result.
The code in question doesnt do much though, so nothing to worry about.
http://www.shatabrick.com
And Borreh for being featured in aspammer'svaluable member's signature.
As the moderator in chief I am obligated to remind you that if you use reddit subscribe to /r/commandandconquer