Are abstract classes and interfaces considered as minimum requirements for classes implementing them in PHP?

Abstract classes and interfaces are not considered as minimum requirements for classes implementing them in PHP. However, implementing abstract classes or interfaces can provide structure and enforce certain methods or properties that child classes must implement. This can help in creating a consistent and predictable class hierarchy in your codebase. 

// Abstract class example
abstract class Vehicle {
    abstract public function start();
    abstract public function stop();
}

class Car extends Vehicle {
    public function start() {
        echo "Car starting...";
    }

    public function stop() {
        echo "Car stopping...";
    }
}

// Interface example
interface Animal {
    public function eat();
    public function sleep();
}

class Dog implements Animal {
    public function eat() {
        echo "Dog eating...";
    }

    public function sleep() {
        echo "Dog sleeping...";
    }
}

Keywords

abstract classes interfaces minimum requirements implementing classes PHP

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