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Padraic Brady's Blog:
Zend Framework 2.0 Dependency Injection (Part 1)
October 05, 2011 @ 12:34:33

In a new post to his blog Padraic Brady takes a look at dependency injection in Zend Framework 2.0. In this first part, however, he introduces the concept of "dependency injection" and offers a few suggestions on its use and tools that can make it simpler.

If you've been watching the PHP weather vane (we call it Twitter for short), you may have noticed a shift in Symfony and Zend Framework. Version 2.0 of both web application frameworks feature Dependency Injection Containers (DICs) as the primary means of creating the objects (and even Controllers) your application will use. This is an interesting shift in a programming language that often stubbornly evaded adopting DICs to any great extent.

He introduces dependency injection (DI) as a method for "injecting" objects and configurations into other interfaces without any specific kind of relation between the two. Part of several DI implementations is a container that does some of the magic object creation for you. He applies this concept to a Zend Framework structure and talks briefly about why these containers are "the devil" because they (usually) add complexity where none is needed. He points out one container library, Pimple, that gets it right in his opinion - defining object creation as closures. In the next part of the series, he'll compare the Zend Framework's DI setup against Pimple (and Symfony's) implementations.

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