What is dependency injection, inversion of control, dependency injection containers, and the service locator design pattern? What do they have in common, what problems do they solve, and what are some of the main differences between them?\r
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This design pattern tutorial (illustrated in PHP) explains the main difference between a dependency injector and a service locator. The most obvious difference is the f that when using a service locator, the locator class itself is a dependency. Whereas, when you use an injector, the component receiving the dependencies has no idea that an injector even exists.\r
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