Book Image

Building RESTful Web Services with PHP 7

By : Waheed ud din
Book Image

Building RESTful Web Services with PHP 7

By: Waheed ud din

Overview of this book

REST is the most wide spread and effective standard to develop APIs for internet services. With the way PHP and its eco-system has modernized the way code is written by simplifying various operations, it is useful to develop RESTful APIs with PHP 7 and modern tools. This book explains in detail how to create your own RESTful API in PHP 7 that can be consumed by other users in your organization. Starting with a brief introduction to the fundamentals of REST architecture and the new features in PHP 7, you will learn to implement basic RESTful API endpoints using vanilla PHP. The book explains how to identify flaws in security and design and teach you how to tackle them. You will learn about composer, Lumen framework and how to make your RESTful API cleaner, secure and efficient. The book emphasizes on automated tests, teaches about different testing types and give a brief introduction to microservices which is the natural way forward. After reading this book, you will have a clear understanding of the REST architecture and you can build a web service from scratch.
Table of Contents (16 chapters)
Title Page
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Return type declaration


Just like parameter type, there is also a return type; it is also optional it is a safe practice to specify the return type.

This is how we can declare a return type:

<?php
function add($num1, $num2):int{
    return ($num1+$num2);
}

echo add(2,4); //6
echo add(2.5,4); //6

As you can see in the case of 2.5 and 4, it should be 6.5, but as we have specified int as a return type, it is performing implicit type conversion. To avoid this and to obtain an error instead of an implicit conversion, we can simply enable a strict type, as follows:

<?php
declare(strict_types=1);
function add($num1, $num2):int{
    return ($num1+$num2);
}

echo add(2,4); //6
echo add(2.5,4); //Fatal error:  Uncaught TypeError: Return value of add() must be of the type integer, float returned