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 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
- The End
- Bibliography
-
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?
Authors have earned$9,882,857writing, 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
The Leanpub 45-day 100% Happiness Guarantee
Within 45 days of purchase you can get a 100% refund on any Leanpub purchase, in two clicks.
See full terms
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), EPUB (for phones and tablets) and MOBI (for 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
C++ Best Practices
Jason TurnerLevel up your C++, get the tools working for you, eliminate common problems, and move on to more exciting things!
Functional Design and Architecture
Alexander GraninSoftware Design in Functional Programming, Design Patterns and Practices, Methodologies and Application Architectures. How to build real software in Haskell with less efforts and low risks. The first complete source of knowledge.
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.
R Programming for Data Science
Roger D. PengThis book brings the fundamentals of R programming to you, using the same material developed as part of the industry-leading Johns Hopkins Data Science Specialization. The skills taught in this book will lay the foundation for you to begin your journey learning data science. Printed copies of this book are available through Lulu.
C++20
Rainer GrimmC++20 is the next big C++ standard after C++11. As C++11 did it, C++20 changes the way we program modern C++. This change is, in particular, due to the big four of C++20: ranges, coroutines, concepts, and modules.
I am a Software Engineer and I am in Charge
Alexis Monville and Michael DoyleI am a Software Engineer and I am in Charge is a real-world, practical book that helps you increase your impact and satisfaction at work no matter who you work with.
In the book, we will follow Sandrine, a fictional character who learns to think in a new way enabling her to take a different course of action.
Invest In Digital Health - The Medical Futurist's Guide
Dr. Bertalan MeskoArtificial Intelligence and Digital Health are booming. In this book, we explain why now it's a good time to invest in Digital Health and give recommendations on where to invest by looking at the top 24 technological trends we find the most promising.
Atomic Kotlin
Bruce Eckel and Svetlana IsakovaFor both beginning and experienced programmers! From the author of the multi-award-winning Thinking in C++ and Thinking in Java together with a member of the Kotlin language team comes a book that breaks the concepts into small, easy-to-digest "atoms," along with exercises supported by hints and solutions directly inside IntelliJ IDEA!
The Hundred-Page Machine Learning Book
Andriy BurkovEverything you really need to know in Machine Learning in a hundred pages.
Mastering STM32
Carmine NovielloWith more than 600 microcontrollers, STM32 is probably the most complete ARM Cortex-M platform on the market. This book aims to be the first guide around that introduces the reader to this exciting MCU portfolio from ST Microelectronics and its official CubeHAL.
Top Bundles
- #1
Software Architecture for Developers: Volumes 1 & 2 - Technical leadership and communication
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
The Future of Digital Health
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 and how technology giants such as Amazon or Google want to conquer... - #3
Cisco CCNA 200-301 Complet
4 Books
Ce lot comprend les quatre volumes du guide préparation à l'examen de certification Cisco CCNA 200-301. - #4
CCDE Practical Studies (All labs)
3 Books
CCDE lab - #5
"The C++ Standard Library" and "Concurrency with Modern C++"
2 Books
Get my books "The C++ Standard Library" and "Concurrency with Modern C++" in a bundle. The first book gives you the details you should know about the C++ standard library; the second one dives deeper into concurrency with modern C++. In sum, you get more than 600 pages full of modern C++ and about 250 source files presenting the standard library... - #6
Modern Management Made Easy
3 Books
Read all three Modern Management Made Easy books. Learn to manage yourself, lead and serve others, and lead the organization. - #7
Programming with Ease
3 Books
Alle drei Bände der Serie Programming with Ease in einem Paket. Darin findest du alles, was ich dir zu den wichtigsten Phasen der Softwareentwicklung im Hinblick auf Clean Code Development für langfristig hohe Produktivität sagen kann.Im Band Slicing findest du die Anforderungsanalyse im Rahmen eines iterativ-inkrementellen Vorgehensmodells aus... - #8
Vagrant Ansible
2 Books
Unveil the power of Ansible and Vagrant with this bundle at a special price. You'll have everything you need to get started with Vagrant - learn the basics and how to create your virtual development environments, using Ansible as provisioner! About Vagrant Cookbook Vagrant Cookbook is a complete guide to get started with Vagrant and create your... - #9
Mastering Containers
2 Books
Docker and Kubernetes are taking the world by storm! These books will get you up-to-speed fast! Docker Deep Dive is over 400 pages long, and covers all objectives on the Docker Certified Associate exam.The Kubernetes Book includes everything you need to get up and running with Kubernetes! - #10
Growing Agile: The Complete Coach's Guide
7 Books
Growing Agile: Coach's Guide Series This bundle provides a collection of training and workshop plans for a variety of agile topics. The series is aimed at agile coaches, trainers and ScrumMasters who often find themselves needing to help teams understand agile concepts. Each book in the series provides the plans, slides, handouts and activity...