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

Scalar types

The first kind of type to get your head around is what is called "scalar." This is a fancy way of saying "simple." The best way to think of "scalar" types is as opposed to "compound" types. A scalar is not made of anything else; it is the smallest unit of data.

According to someone more learned than me on Stack Overflow, the term "scalar" comes from linear algebra, where it means a single number as opposed to a vector or matrix. I'm not a linear algebra specialist, so let's just take it that scalar means the opposite of complex.

The scalar types are as follows:

  • string
  • int
  • float
  • bool

If you want to check dynamically whether a variable is scalar, PHP has a function for that:

PHP: is_scalar - Manual

Let's have a quick look through the scalar types in PHP.


String is the name for textual content. You tend...