Much has been written on Dependency Injection lately, mostly by Padraic Brady (1, 2) and Fabien Potencier (1, 2, 3, 4, 5). My subjective feeling tells me there are now more PHP DI containers out there than CMS or ORMs implemented in PHP, including two written by myself (an overengineered and a useful one). Its an awesome pattern if used on a larger scale and can (re-) wire a complex business application according to a clients needs without having to change much of the domain code. It aims at a complete seperation of object instantiation and dependency tracking from the business logic.
Beginning with version 1.8 Zend Framework is able to integrate any of these DI containers into its Zend_Application component easily.
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