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


An enumerated typeenum 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 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

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...