What I mean by Application-Scope variables is variables that can be available for the Application or Web-Application all the time after starting the application by a trigger. After having the triger fired those Application-Scope Variables, Datastructures, Object, and refrences would be available for all the requests. That's how I'd equate persistant PHP-Applications to having Application-Scope PHP variables.
A lame Example to illustrate the purpose of Application-Scope variables would be the persistant DB connections. Not 100% the same but it's for the same purpose
So if you could have a huge object persistant( Application-Scope object ) that does alot of work for you then that object is a PHP persistant application which I call Application-Scope var or object !
Hope that clears it out.
For single-server multi-threaded architectures this is trivial to do, but it doesn't scale to the multi-server multi-process architecture PHP uses.
-Rasmus
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