Design Patterns

Download the source for the Iterator Pattern or get it on Github.

Download the source for the Adapter Pattern or get it on Github.

Download the source for the Singleton Pattern or get it on Github.

Sometimes you may find yourself in need of an object that can exist once and only once, for example: registry settings, device drivers, or game objects. To do this we use a pattern aptly named the Singleton Pattern. The Singleton utilizes a private constructor and so can only be instantiated through a call to another method. Here is a basic Singleton.class.php:

Download the source for the Decorator Pattern or get it on Github.

Ever need to add new or additional functionality to a class dynamically? Need to make a class that is open for extension but closed for modification? Then the Decorator pattern is for you. How? Simple, we will add a new class to wrap, or decorate, the original class.