为什么我输入parent :: __ construct？

Question

Each time I go to declare an extended class,

Class cookies extends Food{
    public function __construct()
    {
        parent::__construct();
    }
}

Why am I using parent::__construct()?

Is this for inheritance? Does merely extending the class not inherit it's properties?

Answer 1

If that's the sole content of your child class constructor, then you don't need to define the child constructor at all, and it will simply run the parent constructor.

If you do create a child class with a constructor, then that child constructor will run instead of the parent class constructor (even if it's just an empty body); so if you need to run the parent class's constructor as well then you need to call it explicitly by using parent::__construct()