PHP Inheritance and Interfaces

ExamplePHP

<?php
interface Speaker {
  public function speak(): string;
}

abstract class Animal implements Speaker {
  public function __construct(protected string $name) {}
}

class Dog extends Animal {
  public function speak(): string { return "{$this->name} says woof"; }
}

class Cat extends Animal {
  public function speak(): string { return "{$this->name} says meow"; }
}

foreach ([new Dog("Rex"), new Cat("Tom")] as $pet) {
  echo $pet->speak(), "\n";
}

Output

Rex says woof
Tom says meow

Quick check

Which keyword makes a class inherit from another?

extendsimplementsinherits

Finish the quick check (and any code exercise) to complete this lesson, or mark it done yourself.

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