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Simple understanding of Inversion of Control (IOC, (Inversion of Control))
At first, our code dependencies may look like this, here are just examples There are cross-dependencies between three objects and three classes. The actual dependency relationship of our code is actually much more complicated. I can imagine the intersection of more than ten objects, and even horizontal intersection.
Now comes the problem , due to irresistible reasons, PHP version upgrade, requirement changes, etc., we need to replace the α object and delete the β object. How many code changes do we need to make?
It’s time to come up with the IOC .
Instantly refreshing.
The IOC container maintains a collection of object instances and class names globally. When we write a class, we The dependent objects are registered in the container, and are instantiated when the class is called.
This is the idea of IOC. A system achieves "inversion of control" by completely separating organizational control and objects. For Dependency injection, which means achieving decoupling by controlling and instantiating dependent objects elsewhere in the system.
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