Type Hinting is important

One of my favorite PHP interview questions, is: what is Type Hinting and why it’s important? Putting definition in one sentence, Type Hinting is a way to define type of parameter in function signature and it’s a sine qua non to leverage polymorphism. Because of dynamic typing in PHP, parameters don’t need to have type used. Also, by type here, I mean complex types (class, abstract class, interface, array, closure), not primitives like integer or double.

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Injecting repositories to service in Symfony2

It is generally a good idea to wrap business logic into services. Often, such services methods uses doctrine’s repositories to operate on data storage. Injecting whole EntityManager service is very popular approach, but it isn’t the most elegant way I could think of. EntityManager works only as a factory in that case and could lead to usage of other repositories, which might end up with too many responsibilities of given service.
The better way, is to inject single repositories, using factory-service mechanizm, provided by Dependency Injection Container.

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