Abstract Classes - PHP - P60

Pubblicato il: 17 giugno 2020
sul canale di: Dino Cajic

193

Abstract classes represent abstract concepts. In our previous tutorials, we created different classes that inherited properties and methods from its parent. If we look at the Animal class hierarchy, the Animal class itself is an abstract concept. We can vaguely say animal, but what type of animal? A dog might be a narrow enough concept, but a German Shepherd is definitely a concrete class, not abstract.

Abstract classes are classes that start with the keyword abstract. If a class contains at least one abstract method, it must be declared as abstract. If a method in an abstract class is defined as abstract, it can only declare the method’s signature. There can be no implementation of the method itself. Also, all methods that are marked as abstract, when inherited, must be implemented in the child class. You will be required to pretty much copy the method signature completely as is. So, the visibility, signature, etc. Let’s take a look at a couple of examples and hopefully this will make sense.

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