Knowing your state machines
summary
Introduces practical state machines by building a Mealy-style traffic light, then generalizing to a reusable state machine and wiring it into the Symfony Workflow component. Demonstrates job-ad and pull-request examples that need multi-place workflows, shows guard events that block transitions, and notes the component dispatches about 21 events. Workshop includes exercises with tests (three exercises plus bonus), Git branches, a marking store for persistence, and working examples that run and integrate with Twig and Symfony services.
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