Book Image

The Art of Modern PHP 8

By : Joseph Edmonds
5 (1)
Book Image

The Art of Modern PHP 8

5 (1)
By: Joseph Edmonds

Overview of this book

PHP has come a long way since its introduction. While the language has evolved with PHP 8, there are still a lot of websites running on a version of PHP that is no longer supported. If you are a PHP developer working with legacy PHP systems and want to discover the tenants of modern PHP, this is the book for you. The Art of Modern PHP 8 walks you through the latest PHP features and language concepts. The book helps you upgrade your knowledge of PHP programming and practices. Starting with object-oriented programming (OOP) in PHP and related language features, you'll work through modern programming techniques such as inheritance, understand how it contrasts with composition, and finally look at more advanced language features. You'll learn about the MVC pattern by developing your own MVC system and advance to understanding what a DI container does by building a toy DI container. The book gives you an overview of Composer and how to use it to create reusable PHP packages. You’ll also find techniques for deploying these packages to package libraries for other developers to explore. By the end of this PHP book, you'll have equipped yourself with modern server-side programming techniques using the latest versions of PHP.
Table of Contents (19 chapters)
Section 1 – PHP 8 OOP
Free Chapter
Chapter 1: Object-Oriented PHP
Section 2 – PHP Types
Chapter 5: Object Types, Interfaces, and Unions
Section 3 – Clean PHP 8 Patterns and Style
Section 4 – PHP 8 Composer Package Management (and PHP 8.1)
Section 5 – Bonus Section - PHP 8.1


And this concludes our second chapter. In this chapter, we aimed to learn as much as possible within the space available about the core OOP features of PHP. Firstly, we looked at what encapsulation means and the differences between private, protected, and public. We encouraged you to use private as your default, only relaxing this to protected as required. public properties are not normally encouraged as they break encapsulation.

Next, we looked at how inheritance works in PHP. We started with a very simple example and then built up to a more complex example using abstract and final to force or prevent inheritance as required. We also used interfaces to enforce classes implementing defined methods.

Finally, we looked at an alternative approach to building a graph of related classes that avoids using inheritance features and instead uses a technique called composition, whereby classes inherit functionality through dependency injection – the class defines what objects...