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

Encapsulation and visibility

Encapsulation is a foundational feature of OOP in PHP and something you must understand well if you are to successfully grasp OO PHP.

PHP classes "encapsulate data and functionality." The word "encapsulate" simply means "enclose in a capsule." What this means is that the things inside the capsule, in our case the class, are hidden away.

By hiding things away inside our class, we allow ourselves the freedom to change and refactor the internal workings of the class without any fear of issues outside the class – as long as the public methods and properties remain the same. What this means is that the general wisdom is that you should keep as much as possible hidden away and only expose the minimum amount of functionality and data in order to maximize your freedom to refactor.

Here is the official docs page that you should have a thorough read of:

PHP Manual: Visibility