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Chapter 14. Advanced Features of Object-Oriented Programming in PHP 5
In Chapter 4, we introduced the basic concepts of
object-oriented programming, showing how classes are defined and how
objects are created and used with PHP. The techniques shown in Chapter 4 can be used to help build reusable, modular
code, and are applicable when using object-oriented packages such as
the PEAR packages we describe in Chapter 7.
However, much of the power of object-oriented programming
doesn't come from simply reusing code.
In this chapter, we show some more powerful techniques available with
object-oriented programming, including:
Class hierarchies
Polymorphic behavior
Class type hints
Abstract classes and interfaces
