PHP系列学习之AOP
介绍
你以前听说过AOP（Aspect Oriented Programming)吗？虽然在php方面，好像没有过多的使用，但是在企业级开发中，AOP被广泛使用。我将借此文，向大家介绍PHP方面的AOP。
这篇文章主要解释AOP的概念。
什么是AOP？
在应用开发中，我们经常发现需要很多功能，这些功能需要经常被分散在代码中的多个点上，但是这些点事实上跟实际业务没有任何关联。比如，在执行一些特殊任务之前需要确保用户是在登陆状态中，我们把这些特殊人物就叫做"cross-cutting concerns"，让我们通过
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