Xcode development for PHP Apps got a whole lot better with its new source control system (4.3.x).
I simply cloned my github.com repo to my sandboxed web server, and created a new xcode workspace defining that as its base folder.
Of course you don't need github.com. But if you're working in this sort of environment its extremely handy to use xcodes' interface to manage commits/pushes etc, and visualize history; this feature alone makes it worth the extra CPU overhead needed (hardly noticeable on modern processors; but Core 2 Duo's can start to lag).
Sometimes the syntax completion gets in the way; so it may be advisable to turn it off; and if you're accustomed to using editors like BBEdit,TextMate, etc. you'll have to get used to your key commands not behaving like they normally would; I haven't explored the key bindings tabs but the solution may lie there.