No they will still work on php pages.
To edit an existing menu you have to go to:Edit->Preferences and choose "invisible elements" and make sure "Scripts" are visible. You click on the script element to edit the menu from the properties panel.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.