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Editor to share with you what the meaning of AOP in PHP, I believe that most people do not know much, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to understand it!

What is AOP?

In application development, we often find that we need a lot of functions, which are often scattered at multiple points in the code, but these points actually have nothing to do with the actual business. For example, before performing some special tasks, we need to make sure that the user is logged in. We call these special people "cross-cutting concerns". Let's take a look at the definition of "cross-cutting concerns" through Wikipedia.

In computer science, "cross-cutting concerns" means "sectional (or directional) programming". These relationships cannot be well decomposed from other systems (framework design or some implementations), resulting in code duplication, meaningful dependencies in the system, or both.

Now you should have a basic understanding of "horizontal relationships". Let's see what they look like in the code.

Suppose a scenario where you are the editor of a blog site. You need to log in to the site, then create posts, verify posts, edit posts, and so on. If you are not logged in, then you should go directly to the login interface. To ensure that these behaviors are safe, any of the above actions need to be validated as follows.

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