Example.php

<?php

class Animal {
  public static function makeSound(){
    echo "Animal";
  }
  
  public static function vocalize() {
    echo static::makeSound(); 
  }
}



class Dog extends Animal {
  public static function makeSound() {
    echo "Dog";
  }
}

Dog::vocalize(); // Animal

class Husky extends Dog {
    public static function makeSound() {
        echo "Husky";
    }
}

Husky::vocalize(); // Husky