Can I declare a builder in the child classes when the mother class is abstract and already has a builder?

Question

My question is this: If I can declare a constructor in a class abstract and also in the child classes. And also how to access their values. For example:

abstract class Animal {
    private $nome;
    private $idade;

    public funtion __construct($nome, $idade) {
        $this->nome = $nome;
        $this->idade = $idade;
    }
}

And in the daughter class, who inherits from the class Animal:

class Cachorro extends Animal {
    private $corPelo;

    public function __construct($corPelo) {
        $this->corPelo = $corPelo;
    }
}

And when I try to instantiate I call the class Cachorro instantiating the values for Animal:

$dog = new Cachorro('belinha', 4, 'preto');

But that way I can’t access corPelo daughter-class Cachorro, only the values of the mother class Animal.

I’m doing it wrong?

Answer 1

Yes, it can, the constructor is precisely to initialize essential class properties, so each class must have its own constructor.

When a daughter class will initialize, she also needs to initialize the parent class.

To call the parent class builder you will use the parent:

class Cachorro extends Animal {
    private $corPelo;

    public function __construct($nome, $idade, $corPelo) {
        parent::__construct($nome, $idade);
        $this->corPelo = $corPelo;
    }
}

I put in the Github for future reference.

If you do not call the constructor to initialize the class Cachorro will be bad since the class initialization will be missing Animal which seems to me to be essential to the Cachorro be in order.