WebbyLab

Animal.php

<?php

abstract class Animal
{
    /**
     * @var Animal|string $name
     */
    protected $name;

    /**
     * Animal constructor.
     * @param string $name
     */
    public function __construct(string $name)
    {
        return $this->name = $name;
    }

    abstract protected function getName();
}

Cat.php

<?php

class Cat extends Animal
{
    /**
     * Cat constructor.
     * @param string $name
     */
    public function __construct(string $name)
    {
        return parent::__construct($name);
    }

    /**
     * @return Animal|string
     */
    public function getName()
    {
        return $this->name;
    }

    /**
     * @return string
     */
    public function meow()
    {
        return  "Cat $this->name is saying meow";
    }
}

$cat = new Cat('garfield');
echo $cat->getName();
echo $cat->meow();