Martin Sikora 
PHP Reactive Programming 
Build fault tolerant and high performing application in PHP based on the reactive architecture

Reactive Programming helps us write code that is concise, clear, and readable. Combining the power of reactive programming and PHP, one of the most widely used languages, will enable you to create web applications more pragmatically.
PHP Reactive Programming will teach you the benefits of reactive programming via real-world examples with a hands-on approach. You will create multiple projects showing Rx PHP in action alone and in combination with other libraries.
The book starts with a brief introduction to reactive programming, clearly explaining the importance of building reactive applications. You will use the Rx PHP library, built a reddit CLI using it, and also re-implement the Symfony3 Event Dispatcher with Rx PHP. You will learn how to test your Rx PHP code by writing unit tests. Moving on to more interesting aspects, you will implement a web socket backend by developing a browser game. You will learn to implement quite complex reactive systems while avoiding pitfalls such as circular dependencies by moving the Rx JS logic from the frontend to the backend. The book will then focus on writing extendable Rx PHP code by developing a code testing tool and also cover Using Rx PHP on both the server and client side of the application. With a concluding chapter on reactive programming practices in other languages, this book will serve as a complete guide for you to start writing reactive applications in PHP.