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
About the Author
About the Reviewer
Customer Feedback

Scalar type declaration

In PHP7, we can now declare the type of parameters passed to a function. They could be only user defined classes in previous versions, but now they can be scalar types as well. By scalar type, we mean basic primitive types, such as int, string, and float.

Previously, to validate an argument passed to a function, we needed to use some sort of if-else. So, we used to do something like this:

function add($num1, $num2){
    if (!is_int($num1)){
        throw new Exception("$num1 is not an integer");
    if (!is_int($num2)){
        throw new Exception("$num2 is not an integer");

    return ($num1+$num2);

echo add(2,4);  // 6
echo add(1.5,4); //Fatal error:  Uncaught Exception: 1.5 is not an integer

Here we used if to make sure that the type of the variables $num1 and $num2 is int, otherwise we are throwing an exception. If you are a PHP developer from the earlier days who likes to write as little code as possible, then chances are that you were...