Explore the concept of dependency injection in this 57-minute conference talk from PHP UK Conference. Learn the key differences between service location and dependency injection, understand why dependency injection is crucial in modern software development, and discover how to implement this tool effectively. Gain insights into real-world examples of refactoring applications to achieve more explicit, testable, and SOLID-compliant code structures. Suitable for beginners, this presentation provides a comprehensive introduction to dependency injection and its practical applications in PHP development.