You're reading from The Art of Modern PHP 8 Learn how to write modern, performant, and enterprise-ready code with the latest PHP features and practices

Product type Paperback

Published in Oct 2021

Publisher Packt

ISBN-13 9781800566156

Length 420 pages

Edition 1st Edition

Languages

PHP

Tools

MySQL

Concepts

Server Side Web Development

Author (1):

Joseph Edmonds

View More author details

Table of Contents (19) Chapters

Preface

1. Section 1 – PHP 8 OOP

2. Chapter 1: Object-Oriented PHP FREE CHAPTER

3. Chapter 2: Inheritance and Composition, Encapsulation and Visibility, Interfaces and Concretions

4. Chapter 3: Advanced OOP Features

5. Section 2 – PHP Types

6. Chapter 4: Scalar, Arrays, and Special Types

7. Chapter 5: Object Types, Interfaces, and Unions

8. Chapter 6: Parameter, Property, and Return Types

9. Section 3 – Clean PHP 8 Patterns and Style

10. Chapter 7: Design Patterns and Clean Code

11. Chapter 8: Model, View, Controller (MVC) Example

12. Chapter 9: Dependency Injection Example

13. Section 4 – PHP 8 Composer Package Management (and PHP 8.1)

14. Chapter 10: Composer For Dependencies

15. Chapter 11: Creating Your Own Composer Package

16. Section 5 – Bonus Section - PHP 8.1

17. Chapter 12: The Awesomeness That Is 8.1

18. Other Books You May Enjoy

Enumerations

An enumerated type – enum for short – is a special type that has a constrained list of possible values, or enumerators.

If you would like to learn more background on this topic, you can read the lengthy Wikipedia article at https://w.wiki/3i7Z. However, the sentence at the start of this section does pretty much sum it up.

To understand the PHP implementation of enums, the best place to look at the time of writing is the RFC page:

PHP: rfc:enumerations

https://wiki.php.net/rfc/enumerations

Basic and backed enums

One way to think of enums is a bit like a constant array. Something that is hardcoded and can never change when the code is running. There are two kinds of enums – basic (or pure) and backed. These two types of enums correlate conceptually somewhat with indexed and associative arrays, in that a basic enum has just the value, and backed enums have a key and a value associated with that key.

Like associative array keys, backed...