PHP Objects, Patterns, and Practice, Fourth Edition

CHAPTER 11

Performing and Representing Tasks

In this chapter, we get active. I look at patterns that help you to get things done, whether interpreting a minilanguage or encapsulating an algorithm.

This chapter will cover:

• The Interpreter pattern: Building a minilanguage interpreter that can be used to create scriptable applications
• The Strategy pattern: Identifying algorithms in a system and encapsulating them into their own types
• The Observer pattern: Creating hooks for alerting disparate objects about system events
• The Visitor pattern: Applying an operation to all the nodes in a tree of objects
• The Command pattern: Creating command objects ...