Скачать или смотреть Interface - PHP - P61

The topic of interfaces. An interface resembles an abstract class but there are a few differences. With the abstract class, you can create method declarations and implemented methods. Child classes can then inherit an abstract class and override or implement its methods. With an interface, you can only define the functionality. You can’t actually implement anything.

The biggest difference is that a child class can only extend one abstract class but it can implement multiple interfaces. You will hear the term contract when talking about interfaces meaning that once you implement it, you are obligated to define each method that was declared inside the interface.

Our Mammal class is a perfect example of an abstract class. There are certain methods that all mammals share, and do it the same way, so it’s a good idea to actually implement those methods there. I would argue that the Animal class makes a good candidate for an interface. Why? Because although all animals share certain similar traits, they each differ based on the animal.

So, you should force child classes to implement those methods. Interfaces begin with the keyword interface and the methods inside the interface are all abstract. You don’t have to use the abstract keyword. To implement the interface, you use the implements keyword, not the extends keyword.

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