It seems Facebook source code leaked the other day. And for those of you who don't know, Facebook uses PHP. Even though the problem was apparently due to a misconfigured server, it nevertheless exposes the problem with interpreted languages in the web world.
Nick Cubrovic (founder of OmniDrive) has a great post on preventing PHP leakage.
May be this is the reason , a number of enterprises still stick with compiled languages like Java on the web.