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

Final constants

I am a huge fan of using constants in PHP as I believe they are an excellent solution to avoid "magic strings" and "magic numbers" creeping into your code base and making them brittle, hard to refactor, and making typo related bugs an infuriatingly likely issue.

Constants provide a nice solution in that they are solid and predictable, and they cannot be accidentally or deliberately updated with new values – they are hardcoded.

One feature of PHP constants is that they can be overridden in child classes. This can be quite useful where you desire it, but it would also be quite common to desire that your constants are, well… constant.

For class properties and methods, we have had the ability to mark them as final for quite some time. This means that it cannot be overridden in a child class and is a very useful way to ensure things remain robust and predictable.

Before PHP 8, the one place where constants could not be overridden...