A practical guide to replacing messy if-else chains in Symfony applications using the Strategy Pattern. Covers the three core components (interface, concrete strategies, context/orchestrator), and shows how PHP 8 attributes like `#[AutoconfigureTag]` and `#[AutowireIterator]` enable zero-configuration wiring. Includes a document processor example with PDF, CSV, and JSON handlers, a comparison of iterator vs. locator performance characteristics (O(n) vs O(1)), testing strategies, and common pitfalls to avoid such as over-engineering and circular dependencies.