Wendell Adriel lays out a clear, real‑world guide to the state machine pattern in PHP. He shows how to tame messy if/else chains by modeling states, events, guards, and actions, then builds a simple order workflow with enums. I liked how he keeps side effects at the edges and later swaps them for domain events with an outbox for safer, testable code. If you’ve wrestled with business rules or want predictable flows, this is a solid, practical read.

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