Learn what the State Machine Pattern is and how to apply it in your PHP applications with this in-depth article about it

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State machines provide a structured approach to managing complex workflows by defining explicit states, events, and transition rules. This pattern replaces tangled if/else logic with predictable, testable behavior using PHP enums, guards for validation, and actions for side effects. The implementation includes domain events with an outbox pattern to keep decision logic pure while handling side effects reliably. Key benefits include improved clarity, safety from forbidden transitions, better testability, and enhanced observability through logging and documentation generation.

Welcome to the State Machine Pattern

<p>This pattern is used in Drupal, thanks to the State machine module (<a href="https://www.drupal.org/project/state_machine" target="_blank" rel="noopener nofollow">https://www.drupal.org/project/state_machine</a>).</p>
<p>Drupal Commerce implemented this pattern perfectly for tracking Order states.</p>
