PHP Reactive Programming

Book Image

PHP Reactive Programming

By : Martin Sikora

Book Image

PHP Reactive Programming

By: Martin Sikora

Overview of this book

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 RxPHP 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 RxPHP library, built a reddit CLI using it, and also re-implement the Symfony3 Event Dispatcher with RxPHP. You will learn how to test your RxPHP 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 RxJS logic from the frontend to the backend. The book will then focus on writing extendable RxPHP code by developing a code testing tool and also cover Using RxPHP 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.

PHP Reactive Programming

PHP Reactive Programming

Credits

About the Author

About the Author

About the Reviewer

About the Reviewer

www.PacktPub.com

www.PacktPub.com

Customer Feedback

Customer Feedback

Preface

Free Chapter

Introduction to Reactive Programming

Introduction to Reactive Programming

Imperative programming

Declarative programming

Sequential and parallel programming

Asynchronous programming

Functional programming

Reactive programming

Reactive Extensions

Introducing RxPHP

Reactive Programming with RxPHP

Reactive Programming with RxPHP

Basic principles of Reactive Extensions

Naming conventions in Reactive Extensions

Components of RxPHP

Writing the DebugSubject class

Writing JSONDecodeOperator

Writing CURLObservable

The proc_open() and non-blocking fread()

Event loop and RxPHP

Writing a Reddit Reader with RxPHP

Writing a Reddit Reader with RxPHP

Examining RxPHP's internals

Observable::create() and Observable::defer()

Writing a Reddit reader using RxPHP

Non-blocking CURLObservable

Types of disposable classes

Reactive versus a Typical Event-Driven Approach

Reactive versus a Typical Event-Driven Approach

Handling error states in operator chains

The concat() and merge() operators

Writing a reactive event dispatcher

Testing RxPHP Code

Testing RxPHP Code

The doOn*() operators

Installing the PHPUnit package

Basics of writing tests using PHPUnit

Testing RxPHP code

Testing SumOperator

Testing ForkJoinObservable

PHP Streams API and Higher-Order Observables

PHP Streams API and Higher-Order Observables

Using Promises in PHP

PHP Streams API

Higher-order Observables

Implementing Socket IPC and WebSocket Server/Client

Implementing Socket IPC and WebSocket Server/Client

Backpressure in Reactive Extensions

Implementing ProcessObservable

Server Manager application

Server Manager and the Unix socket server

Implementing a WebSocket server

Implementing a WebSocket client

Multicasting in RxPHP and PHP7 pthreads Extension

Multicasting in RxPHP and PHP7 pthreads Extension

Multicasting in RxPHP

PHP pthreads extension

RxPHP and pthreads

Multithreaded and Distributed Computing with pthreads and Gearman

Multithreaded and Distributed Computing with pthreads and Gearman

Introduction to the PHP Parser library

Implementing ThreadPoolOperator

Introduction to Gearman

Using Advanced Operators and Techniques in RxPHP

Using Advanced Operators and Techniques in RxPHP

The zip() operator

The window() operator

The materialize() and dematerialize() operators

Error handling in RxPHP operator chains

The Observable::create() method versus the Subject class

Call stack length and EventLoopScheduler

Unsubscribing versus completing an Observable

Anonymous operators

Writing a custom DirectoryIteratorObservable

FTP client with RxPHP

Reusing RxPHP Techniques in RxJS

Reusing RxPHP Techniques in RxJS

A quick introduction to RxJS 5 in Node.js

Higher-order Observables in RxJS 5 and RxPHP

Operators specific for RxJS 5

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Imperative programming

Imperative programming is a programming paradigm around executing statements that change the program's state.

What this means in human language:

Programming paradigm: This is a set of concepts defining a style of building and structuring programs. Most programming languages, such as PHP, support multiple paradigms. We can also think of it as a mindset and a way we approach problems when using such paradigms.
Statements: Units of action with side effects in imperative programming evaluated in sequences usually containing expressions. Statements are executed for their side effects and expressions for their return value. Consider this example:
```
        $a = 2 + 5 
```
This line of code is a statement where 2 + 5 is an expression. The expected side effect is assigning the value 7 to the $a variable. This leads to changing the program's current state. Another statement could be, for instance:
```
        if ($a > 5) { } 
```
This statement has one expression and no return value.
State: Values of program variables in memory at any given time. In imperative programming, we define a series of statements that control the program's flow and, therefore, change its state.