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

Chapter 5: Object Types, Interfaces, and Unions

In this chapter, we're going to look specifically at object and class types.

Objects, like scalars, have types. Unlike scalars, though, a single object can be regarded as one of a potentially large number of types. Let's explore how this works.

We'll begin by looking at object type inheritance. Then, we are going to understand how object comparison works and the difference between identity (===) and equality (==) when it comes to objects.

Finally, in this chapter, we're going to look at the relationship between object variables and instances and look to understand the way that in PHP, objects are passed by reference by default.

The topics in this chapter are interdependent and so it is tricky to find the correct order to explain things. If this is all new to you, it might be useful to read through the chapter twice so that it all properly makes sense to you.

The following topics will be covered in this...