Summary

The new object model in PHP 5 is the single biggest and most robust change in PHP since PHP 4.0 was released. Without these changes, some of the best new technologies available in PHP 5, such as simplexml, tidy, and soap, would either be less useful or nonexistent. Much of what I have talked about in this chapter reflects standard object-oriented programming concepts, and if you need further assistance with the concepts, plenty of print and online resources can help to explain how object-oriented programming works.