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

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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

Dependency injection and the service locator

Something you may have realized when looking at ToyMVC is the fact that there is quite a lot of work going on to build instances of objects. Also, you could imagine that if the app grew to real-world sizes, then the amount of work that would need to be done in AppFactory could become quite substantial.

Furthermore, due to the complexity of building up a large graph of object instances, there is also the issue that this is generally going to be very wasteful. PHP's requests are not stateful and when instantiating an MVC app, it is almost certain to serve one – and only one – request. There is no need to fire up instances of every single piece of the application when we may not need them all.

Thankfully, there is now a widely accepted best practice solution for this that is incredibly developer-friendly – dependency injection, or DI for short.

Now, I say this is developer-friendly, but that does not mean...