design patterns in php 5

Adaptor pattern helps a class to use some interfaces which are not usable by that class without the adapter class.

Singleton pattern has a private and static constructor.so that there will only one instance of a class.

Abstract factory pattern has some abstract class that are override by other classes.

Decorator pattern adds additional features to an object dynamically.

Observer pattern maintains a one-to-main dependency.so,when one object changes other object updated accordingly.
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1. OpenCart 1.4 Template Design Cookbook.
2. Joomla Mobile Development Beginners Guide