Domain-Driven Design in PHP
Domain-Driven Design in PHP
Discover DDD, Architectural Styles, Tactical Design Implementations, and Bounded Context Integration with PHP 7.4 examples
About the Book
In 2014, after two years of reading about and working with Domain-Driven Design, Carlos and Christian, friends and workmates, traveled to Berlin to participate in Vaughn Vernon's Implementing Domain-Driven Design Workshop. The training was fantastic, and all the concepts that were swirling around in their minds prior to the trip suddenly became very real. However, they were almost no PHP developers in a room full of Java and .NET developers.
Around the same time, Keyvan co-founded Funddy, a crowdfunding platform for the masses built on top of the concepts and building blocks of Domain-Driven Design. Domain-Driven Design proved itself effective in the exploratory process and modeling of building an early-stage startup like Funddy. It also helped handle the complexity of the company, with its constantly changing environment and requirements. And after connecting with Carlos and Christian and discussing the book, Keyvan proudly signed on as the third writer.
Domain-Driven Design has arrived to the PHP community with lots of talk but no real code detailing how to implement Tactical DDD patterns or how to integrate Bounded Contexts with REST and/or messaging strategies. Without being in a Training session and no PHP real examples, learning DDD can be challenging.
Together, we've written the book we wanted to have when we started with Domain-Driven Design. It's full of examples, production-ready code, shortcuts, and our recommendations based on our experiences of what worked and what didn't for our respective teams. We arrived at Domain-Driven Design via its building blocks — Tactical Patterns — which is why this book is mainly about them. Reading it will help you learn them, write them, and implement them. You'll also discover how to integrate Bounded Contexts using synchronous and asynchronous approaches, which will open your world to strategic design — though the latter is a road you'll have to discover on your own.
About the Authors
About the Contributors
Addicted to software development, who loves to share the knowledge he learns with others. Enjoys exploring many areas of the field, ranging from algorithms to software architectural design. Co-hosts a weekly development podcast found at ThreeDevsandAMaybe.com. Has worked in an agency setting, freelance and now at MyBuilder.
Reader Testimonials
Raúl Araya (@nubeiro)
Lead Developer at NordPay Financial
Last part of the book should be called “developer p0rn”. I really enjoyed the contents. Looking forward to see it actually finished.
Axxon (@PhronimaAxxon)
Coder and Musician
Thanks for that practical guide about EventStore in PHP. Just need to play with it now!
Paulo Victor (@Pv_Fusion)
Open Source Developer
Currency and Money its great practical example on @dddbook #DDDinPHP
Ignacio Sánchez (@isholgueras)
Front-end and Drupal Developer
I bought it yesterday, awesome book. Highly recommended! Thanks guys!
Tim Glabisch (@timglabisch)
Developer at SensioLabs Deutschland
I bought it yesterday and read all the night. Awesome #book, every #php dev should read!
Fernando Arconada (@farconadaT3)
Author of “Testing for Symfony 2 Applications”
It's an awesome book
Table of Contents
- Foreword by Matthias Noback
-
Preface
- Who Should Read This Book
- DDD and PHP Community
- Summary of Chapters
- Code and Examples
- Acknowledgements
-
About the Authors
- Carlos Buenosvinos
- Christian Soronellas
- Keyvan Akbary
-
Getting Started with Domain-Driven Design
- Why Domain-Driven Design Matters
- The Three Pillars of Domain-Driven Design
- Considering Domain-Driven Design
- The Tricky Parts
- Strategical Overview
- Related Movements: Microservices and Self-Contained Systems
- Wrap-Up
-
Architectural Styles
- Spaghetti Architecture
- Layered Architecture
- Hexagonal Architecture: Inverting Dependencies
- Command Query Responsibility Segregation (CQRS)
- Event Sourcing
- Wrap-Up
-
Value Objects
- Definition
- Value Object vs. Entity
- Currency and Money Example
- Characteristics
- Basic Types
- Testing Value Objects
- Persisting Value Objects
- Security
- Wrap-Up
-
Entities
- Introduction
- Objects vs. Primitive Types
- Identity Operation
- Persisting Entities
- Testing Entities
- Validation
- Entities and Domain Events
- Wrap-Up
-
Services
- Application Services
- Domain Services
- Domain Services and Infrastructure Services
- Testing Domain Services
- Anemic Domain Models vs. Rich Domain Models
- Wrap-Up
-
Domain Events
- Introduction
- Definition
- Characteristics
- Modeling Events
- Doctrine Events
- Persisting Domain Events
- Publishing Events from the Domain Model
- Spreading the News to Remote Bounded Contexts
- Wrap-Up
-
Modules
- General Overview
- Leverage Modules in PHP
- Bounded Contexts and Applications
- Structuring Code in Modules
- Wrap-Up
-
Aggregates
- Introduction
- Key Concepts
- What Is an Aggregate?
- Why Aggregates?
- A Bit of History
- Anatomy of an Aggregate
- Aggregate Design Rules
- Sample Application Service: User and Wishes
- Transactions
- Wrap Up
-
Factories
- Factory Method on Aggregate Root
- Factory on Service
- Testing Factories
- Wrap-Up
-
Repositories
- Definition
- Repositories Are Not DAOs
- Collection-Oriented Repositories
- Persistence-Oriented Repository
- Extra Behavior
- Querying Repositories
- Managing Transactions
- Testing Repositories
- Testing Your Services with In-Memory Implementations
- Wrap-Up
-
Application
- Requests
- Anatomy of an Application Service
- Testing Application Services
- Transactions
- Security
- Domain Events
- Command Handlers
- Wrap-Up
-
Integrating Bounded Contexts
- Integration Through the Data Store
- Integration Relationships
- Implementing Bounded Context Integrations
- Wrap-Up
-
Appendix: Hexagonal Architecture with PHP
- Introduction
- First Approach
- Repositories and the Persistence Edge
- Decoupling Business and Persistence
- Migrating our Persistence to Redis
- Decouple Business and Web Framework
- Rating an idea using the API
- Console app rating
- Testing Rating an Idea UseCase
- Testing Infrastructure
- Arggg, So Many Dependencies!
- Domain Services and Notification Hexagon Edge
- Let’s Recap
- Hexagonal Architecture
- Key Points
- What’s Next?
- The End
- Bibliography
The Leanpub 60-day 100% Happiness Guarantee
Within 60 days of purchase you can get a 100% refund on any Leanpub purchase, in two clicks.
See full terms
Do Well. Do Good.
Authors have earned$11,968,682writing, publishing and selling on Leanpub, earning 80% royalties while saving up to 25 million pounds of CO2 and up to 46,000 trees.
Learn more about writing on Leanpub
Free Updates. DRM Free.
If you buy a Leanpub book, you get free updates for as long as the author updates the book! Many authors use Leanpub to publish their books in-progress, while they are writing them. All readers get free updates, regardless of when they bought the book or how much they paid (including free).
Most Leanpub books are available in PDF (for computers) and EPUB (for phones, tablets and Kindle). The formats that a book includes are shown at the top right corner of this page.
Finally, Leanpub books don't have any DRM copy-protection nonsense, so you can easily read them on any supported device.
Learn more about Leanpub's ebook formats and where to read them
Top Books
- #1
OpenIntro Statistics
David Diez, Christopher Barr, Mine Cetinkaya-Rundel, and OpenIntroA complete foundation for Statistics, also serving as a foundation for Data Science.
Leanpub revenue supports OpenIntro (US-based nonprofit) so we can provide free desk copies to teachers interested in using OpenIntro Statistics in the classroom and expand the project to support free textbooks in other subjects.
More resources: openintro.org.
- #2
Linear Algebra
Elira Curri and Tanush ShaskaAnswers to selected problems included.
- #3
Ansible for DevOps
Jeff GeerlingAnsible is a simple, but powerful, server and configuration management tool. Learn to use Ansible effectively, whether you manage one server—or thousands.
- #4
A Guide To The Future Of Hospitals
Dr. Bertalan MeskoFor centuries, scientists have been trying to envision the future of hospitals. Following the recent shift towards digital health technologies, in part precipitated by COVID-19, it is natural for one to wonder how these developments will impact hospitals. What can we expect from them in the future? Will there be hospitals at all in a decade’s time?
- #5
C++20 - The Complete Guide
Nicolai M. JosuttisAll new language and library features of C++20 (for those who know previous C++ versions).
The book presents all new language and library features of C++20. Learn how this impacts day-to-day programming, to benefit in practice, to combine new features, and to avoid all new traps.
Buy early, pay less, free updates.
Other books:
- #6
Modern IT Automation with PowerShell
The DevOps Collective, Inc. and Michael ZanattaA PowerShell Textbook written by the community for the community!
- #7
The Rails 7 Way
Obie Fernandez, Lucas Dohmen, and Tom Henrik AadlandThe Rails™ 7 Way is the comprehensive, authoritative reference guide for professionals delivering production-quality code using modern Ruby on Rails. It illuminates the entire Rails 7 API, its most powerful idioms, design approaches, and libraries. Building on the previous editions, this edition has been heavily refactored and updated.
- #8
Mastering STM32 - Second Edition
Carmine NovielloWith more than 1200 microcontrollers, STM32 is probably the most complete ARM Cortex-M platform on the market. This book aims to be the most complete guide around introducing the reader to this exciting MCU portfolio from ST Microelectronics and its official CubeHAL and STM32CubeIDE development environment.
- #9
node-opcua by example
Etienne RossignonGet the best out of node-opcua through a set of documented examples by the author himself that will allow you to create stunning OPCUA Servers or Clients.
- #10
EZ Tools Manuals
Eric Zimmerman and Andrew RathbunEric Zimmerman's Tools are free, open-source, widely taught around the world. This is the official manual for all of his command line and GUI tools.
Top Bundles
- #1
Software Architecture
2 Books
"Software Architecture for Developers" is a practical and pragmatic guide to modern, lightweight software architecture, specifically aimed at developers. You'll learn:The essence of software architecture.Why the software architecture role should include coding, coaching and collaboration.The things that you really need to think about before... - #2
CCIE Service Provider Ultimate Study Bundle
2 Books
Piotr Jablonski, Lukasz Bromirski, and Nick Russo have joined forces to deliver the only CCIE Service Provider training resource you'll ever need. This bundle contains a detailed and challenging collection of workbook labs, plus an extensively detailed technical reference guide. All of us have earned the CCIE Service Provider certification... - #3
Pattern-Oriented Memory Forensics and Malware Detection
2 Books
This training bundle for security engineers and researchers, malware and memory forensics analysts includes two accelerated training courses for Windows memory dump analysis using WinDbg. It is also useful for technical support and escalation engineers who analyze memory dumps from complex software environments and need to check for possible... - #5
All the Books of The Medical Futurist
6 Books
We put together the most popular books from The Medical Futurist to provide a clear picture about the major trends shaping the future of medicine and healthcare. Digital health technologies, artificial intelligence, the future of 20 medical specialties, big pharma, data privacy, digital health investments and how technology giants such as Amazon... - #7
Statistics - All Lee Baker's Books
10 Books
This bundle includes all of the statistics books that Lee Baker has published at LeanPub 13 Statistics Books*1 PlaceNo Hassle! All in both epub and mobi formats - perfect for all devices and screen sizes. --------------------------------------------------------- *The book listed as Getting Started With Statistics is a bundle of 4 books...
