Book Image

Mastering PHP Design Patterns

By : Junade Ali
Book Image

Mastering PHP Design Patterns

By: Junade Ali

Overview of this book

Design patterns are a clever way to solve common architectural issues that arise during software development. With an increase in demand for enhanced programming techniques and the versatile nature of PHP, a deep understanding of PHP design patterns is critical to achieve efficiency while coding. This comprehensive guide will show you how to achieve better organization structure over your code through learning common methodologies to solve architectural problems. You’ll also learn about the new functionalities that PHP 7 has to offer. Starting with a brief introduction to design patterns, you quickly dive deep into the three main architectural patterns: Creational, Behavioral, and Structural popularly known as the Gang of Four patterns. Over the course of the book, you will get a deep understanding of object creation mechanisms, advanced techniques that address issues concerned with linking objects together, and improved methods to access your code. You will also learn about Anti-Patterns and the best methodologies to adopt when building a PHP 7 application. With a concluding chapter on best practices, this book is a complete guide that will equip you to utilize design patterns in PHP 7 to achieve maximum productivity, ensuring an enhanced software development experience.
Table of Contents (14 chapters)
Mastering PHP Design Patterns
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface

Observer pattern (SplObserver/SplSubject)


The Observer design pattern essentially allows an object (the subject) to maintain a list of observers that are automatically notified when the state of the that object changes.

This pattern applies a one-to-many dependency between objects; there is always one subject that updates many observers.

The Gang of Four originally identified that this pattern was particularly applicable in cases where an abstraction has two aspects, with one dependent on the other. In addition to this, it is very useful when a change to object requires changes to the others and you don't know how many other objects need to be changed. Finally, this pattern is also incredibly useful when an object should notify other objects without making assumptions about what those objects are, thus making this pattern great for loosely coupling this relationship.

PHP provides a very useful interface called SplObserver and SplSubject. These interfaces provide the template for implementing...