WARNING! Today's lesson will show you that static members are approaches that actually violate the object-oriented principles. OOP includes them only for special cases and in general everything can be written without static members. We always have to think carefully before adding static members. Generally, I would recommend for you not to use static members ever, unless you're absolutely sure what you're doing. Like global variables, static members are something that enable you to write bad code and violate good practices. Today, we'll go over this topic just to make you understand. Use this knowledge wisely, there will be less evil in the world.
We can declare various elements as static, let's start with properties. As I mentioned in the introduction, static elements belong to a class, not to an instance. So the data stored there can be read even if an instance of the class has not been declared. Basically, we could say that static properties are shared among all class instances, but even that wouldn't be accurate since they aren't actually related to instances.
Let's create a new folder (e.g.
static/) and create a simple
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