DevShed continues their series on the Visitor objects in PHP5 with this second part, looking at expanding the "application range" of the objects.

Well, at this stage I'm assuming that creating visitor objects with PHP isn't a strange concept to you any longer, therefore I'll continue this journey by developing some additional -yet useful- examples on how to build up and implement visitors with PHP 5. The main purpose of this is simply reaffirming the concepts deployed in the first tutorial, so you can have a solid background for including your own visitor classes inside your PHP applications.

They start off by creating a new abstract class to use in this part, a User class with plenty of properties and methods. Next up, they make a class extending this base, abstract class to make a SoftwareUser that will accept visitor objects. They then use this interface and create a Visitor class to make the calls, showing a code example of them playing nicely together.