symfony-knowledge
Symfony Knowledge Base
Quick reference for Symfony framework patterns, DDD integration, and PHP implementation guidelines for auditing and generating Symfony-based applications.
Core Principles
- Bundle System — Symfony's plugin mechanism. Third-party code is installed as bundles; application code lives outside bundles in
src/. - Symfony Flex — Automates bundle installation via recipes. Standard dirs:
config/,src/,public/,var/,migrations/,tests/,templates/. - Kernel — Entry point that boots the container, registers bundles, loads configuration. Must remain thin — no business logic.
Quick Checklists
DDD-Compatible Symfony Project
- Domain layer has zero Symfony imports
- Doctrine mapping uses XML or PHP config (not entity attributes)
- Controllers are invokable (single action per class)
- Messenger handles commands and queries via separate buses
- Value Objects use custom Doctrine types
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