A short tale about state machine
summary
A practical comparison of PHP state machines shows how a simple boolean flag evolves into a real graph of states and transitions, with concrete examples wiring side effects like inventory updates via callbacks and events. Configuration uses guard / before / after callbacks to block or trigger work; implementations demonstrated are WinzouStateMachine ~5,000 installs/day, Symfony Workflow doubles installs and has better docs and Symfony integration, and a third library <1,000 installs, lightly maintained. Watch for the silent bug where code calls setState directly and bypasses guards and callbacks, breaking side effects.
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