PHP 8 Objects, Patterns, and Practice: Mastering OO Enhancements, Design Patterns, and Essential Development Tools

© Matt Zandstra 2021

M. ZandstraPHP 8 Objects, Patterns, and Practicehttps://doi.org/10.1007/978-1-4842-6791-2_8

8. Some Pattern Principles

Matt Zandstra¹  

(1)

Brighton, UK

 

Although design patterns simply describe solutions to problems, they tend to emphasize solutions that promote reusability and flexibility. To achieve this, they manifest some key object-oriented design principles. We will encounter some of them in this chapter and in more detail throughout the rest of the book.

This chapter will cover the following topics:

• Composition: How to use object aggregation to achieve greater flexibility than you could with inheritance alone

• Decoupling: How to reduce dependency between elements in a system

• The power of the interface: Patterns and polymorphism ...