Async PHP: The Complete Guide

PHP has traditionally been perceived as a synchronous language, but with the introduction of Fibers in PHP 8.1 and mature frameworks (ReactPHP, Amp), asynchronous development has become not just possible, but extremely efficient. The book "Async PHP: The Complete Guide" is a practical guide that will take you step by step from the basics of non-blocking I/O to building production-ready asynchronous services.

What is this book about?

The publication covers all key aspects of asynchronous programming in PHP:

• Theoretical foundations: event loop, non-blocking operations, coroutines vs threads, concurrency models.
• ReactPHP: event loop, creating HTTP servers, working with sockets, DNS, file system.
• Amp: coroutines, promises, parallel tasks, integration with PSR-7 and PSR-15.
• Fibers in PHP 8.1+: how to use built-in coroutines, debugging, limitations.
• Practical projects: asynchronous web server, WebSocket chat, parser with thousands of concurrent requests, microservice on Amp.
• Testing and profiling: unit tests for asynchronous code, benchmarks, finding bottlenecks.

Who is this book for?

• PHP developers who want to go beyond the synchronous "request-response" model.
• Architects of high-load systems looking for an alternative to multithreading.
• Team leads planning to migrate legacy projects to asynchronous rails.
• Backend engineers familiar with async/await in other languages (JavaScript, Python, Go) but wanting to apply these patterns in PHP.

What will you learn?

• How to avoid blocking when working with databases, Redis, external APIs.
• How to build a WebSocket chat server without Node.js.
• How to handle thousands of concurrent connections on a single PHP process.
• How to combine ReactPHP and Amp in one project.
• How to write readable, maintainable asynchronous code without "callback hell".
• How to profile and optimize event-driven applications.

The book contains over 50 ready-to-run code examples and includes links to a repository with projects. Whether you are building a real-time application, a high-load parser, or simply want to master modern PHP — this guide will become your go-to resource.

Note: Comfortable reading requires a solid knowledge of PHP 8.0+ and a basic understanding of OOP. Knowledge of asynchronous programming is not required — all concepts are explained from scratch.