The src/ Layout for Hexagonal PHP: Layers and Import Rules

Book: Decoupled PHP — Clean and Hexagonal Architecture for Applications That Outlive the Framework

Also by me: Thinking in Go (2-book series) — Complete Guide to Go Programming + Hexagonal Architecture in Go

My project: Hermes IDE | GitHub — an IDE for developers who ship with Claude Code and other AI coding tools

Me: xgabriel.com | GitHub

You read the hexagonal post, you liked the hexagon diagram, and then you opened your editor and made three folders: Domain, Application, Infrastructure. Good start. Two weeks later a use Doctrine\ORM\EntityManagerInterface sits at the top of a domain entity, and nobody remembers approving it. The folders were a suggestion. Nothing stopped the import.