PHP Web Services: APIs and Web Services in PHP

Introduction

The book "PHP Web Services" (author: Lorna Mitchell, 2016, 200 pages) is a practical guide to designing and implementing web services in PHP. In the era of microservices and distributed systems, the ability to create reliable APIs is becoming a mandatory skill for a PHP developer. Lorna Mitchell, an experienced engineer and conference speaker, offers a focused approach: without unnecessary theory, with an emphasis on real-world examples and best practices.

What is this book about?

The book covers the complete lifecycle of creating a web service: from choosing a data format to deployment and monitoring. The main focus is on RESTful architecture, but alternative approaches (SOAP, RPC) are also discussed. The author systematically covers:

• HTTP basics and REST principles;
• Data exchange formats: JSON, XML, their serialization and deserialization in PHP;
• Endpoint design, API versioning;
• Authentication and authorization (Basic Auth, OAuth 2.0, API keys);
• Error handling and HTTP status codes;
• Testing web services using PHPUnit and tools like Postman;
• API documentation (OpenAPI/Swagger);
• Performance optimization (caching, pagination, rate limiting).

Who is the book for?

The book is intended for intermediate PHP developers who are already familiar with the basics of the language and want to learn how to create APIs. Beginners may need to study OOP in PHP and basic HTTP principles beforehand. The book will also be useful for backend engineers transitioning from other languages, and for tech leads who want to standardize the approach to web services within their team.

What will the reader learn?

After reading, you will be able to:

• Design RESTful APIs considering idempotency and HATEOAS;
• Implement authentication via OAuth 2.0 and JWT;
• Process requests and generate responses in JSON and XML;
• Write unit and integration tests for APIs;
• Document APIs using OpenAPI;
• Configure CORS, caching, and rate limiting;
• Avoid common mistakes (data leaks, incorrect status codes, lack of validation).

Strengths of the book

Practical focus. Each chapter contains ready-to-use code examples that can be adapted for your own projects. The author does not delve into abstract concepts but immediately shows how to apply theory in practice.

Emphasis on security. Dedicated sections cover protection against SQL injection, XSS attacks, cross-site request forgery (CSRF), and secure token storage. This is especially important for public APIs.

Modern stack. Despite the publication year (2016), the book uses current approaches: PSR-7 (HTTP messages), Composer, Guzzle, Slim Framework. Examples are easily transferable to Laravel or Symfony.

Conciseness. 200 pages is an optimal volume for a quick immersion. The book is not overloaded with fluff; every paragraph carries meaning.

Who is it recommended for?

I recommend this book to all PHP developers who want to systematize their knowledge of web services. It will be useful both for freelancers creating APIs for mobile applications and for employees of large companies working on microservice architecture. If you already use frameworks, the book will help you understand what happens "under the hood" of their routing and middleware.

The only limitation: the book does not cover asynchronous queues, WebSocket, or GraphQL — these are topics for separate study. But as a foundation for REST, it is one of the best guides on the market.