Domain-Driven Design in PHP
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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.

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About the Authors

Carlos Buenosvinos
Carlos Buenosvinos

I am an Extreme Programmer (XP) and DevOps with more than 20 years of experience in developing Web and Mobile Applications. For the last ten years, I have played various leading roles such as Tech Lead, VP of Engineering and CTO. I have mentored engineering and product teams up to 150 members in multiple different markets such as E-commerce, E-Learning, Payment Processing, Classifieds, and Recruiting Market.

As an employee and consultant, I have contributed to the success of start-ups and well-established brands. Some examples are SEAT, XING, Atrápalo, PCComponentes, Emagister, eBay, Lowpost, Vendo, Riplife, Universitat International de Catalunya (UIC), and many more.

I am the happy creator of Ansistrano, the most starred Ansible Galaxy role. I am also the author of the book Domain-Driven Design in PHP. I am also a conference speaker, and since 2016, I have a video blog about Development Best Practices called Rigor Talks. I organized the DevOps Barcelona Conference and the PHP Barcelona Conference.

My main areas of expertise are the Agile Team Management (Scrum and Kanban), Best Development Practices (Extreme Programming, Domain-Driven Design, and Microservice Architectures) and Digital Transformation (Agile, XP, and DevOps).

Christian Soronellas
Christian Soronellas

Christian is an Extreme Programmer and has over 15 years of experience helping tech companies succeed from a broad variety of roles, from Software Engineer to CTO. He has helped companies such as a Privalia, Emagister, Atrápalo, Enalquiler, PlanetaHuerto, PcComponentes or Opositatest. He is the author of the book Domain-Driven Design in PHP as well as a conference co-organizer of DevOps Barcelona Conference and PHP Barcelona Conference

Keyvan Akbary
Keyvan Akbary

Keyvan is an Engineering Leader and programmer with more than 15 years of experience crafting products customers love and helping teams succeed. He understands technology as a medium for providing value, not the end itself. He has a passion for Distributed Systems, Software fundamentals, SOLID principles, Clean Code, Design Patterns, Domain-Driven Design, and Testing; as well as being a sporadic Functional Programmer. For the last 7 years, he has also focused on growing teams in high scale-up product companies, advocating for customer-centric product development, Extreme Programming, DevOps, Lean and Kanban.

He has worked on countless projects as a freelancer, on video streaming at Youzee, tradesman marketplace at MyBuilder, in addition to founding his own crowdfunding startup Funddy, and leading FinTech teams at Wise. Currently, he is leading engineering in the ride-hailing space as Head of Engineering at Cabify.

He is also the author of Domain-Driven Design in PHP and CQRS by Example.

About the Contributors

Edd Mann
Edd Mann

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 Has worked in an agency setting, freelance and now at MyBuilder.

Reader Testimonials

Raúl Araya (@nubeiro)
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)
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)
Paulo Victor (@Pv_Fusion)

Open Source Developer

Currency and Money its great practical example on @dddbook #DDDinPHP

Ignacio Sánchez (@isholgueras)
Ignacio Sánchez (@isholgueras)

Front-end and Drupal Developer

I bought it yesterday, awesome book. Highly recommended! Thanks guys!

Tim Glabisch (@timglabisch)
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)
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

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