Book Image

Functional PHP

By : Gilles Crettenand
Book Image

Functional PHP

By: Gilles Crettenand

Overview of this book

<p>A functional approach encourages code reuse, greatly simplifies testing, and results in code that is concise and easy to understand. This book will demonstrate how PHP can also be used as a functional language, letting you learn about various function techniques to write maintainable and readable code.</p> <p>After a quick introduction to functional programming, we will dive right in with code examples so you can get the most of what you’ve just learned. We will go further with monads, memoization, and property-based testing. You will learn how to make use of modularity of function while writing functional PHP code.</p> <p>Through the tips and best practices in this book, you’ll be able to do more with less code and reduce bugs in your applications. Not only will you be able to boost your performance, but you will also find out how to eliminate common loop problems. By the end of the book, you will know a wide variety of new techniques that you can use on any new or legacy codebase.</p>
Table of Contents (19 chapters)
Functional PHP
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

The Closure class


All anonymous functions are in fact an instance of the Closure class. However, as stated in the documentation (http://php.net/manual/en/class.closure.php), this class does not use the aforementioned __invoke method; it's a special case in the PHP interpreter:

Besides the methods listed here, this class also has an __invoke method. This is for consistency with other classes that implement calling magic, as this method is not used for calling the function.

This method on the class allows you to change to which object the $this variable will be bound inside the closure. You can even bind an object to a closure created outside of the class.

If you start using the features of the Closure class, keep in mind that the call method was just recently added in PHP 7.