Question

Base Class:

class A {

    public x;
    public y;

    public function __construct {

        $this->x = new X();
        $this->y = new Y();
    }
}

Class X:

class X extends A {

    public function __construct {}

    public function job() {

        echo 'x working!';
    }
}

Class Y:

class Y extends A {

    public function __construct {}

    public function job() {

        var_dump($this->x);    // NULL, Why???

        $this->x->job();
    }
}

Problem: When I’m calling x->job() from inside of class Y, I have no access to the X already instanced object totally, and var_dump shows it’s null.

Any ideas what’s wrong with that?

Thanks! 🙂

Update:

If I use parent::__construct(); in the child class’ __construct() method, then it would generates Fatal Error: maximum function nesting level of '100' reached, aborting!. That’s why I add those empty __construct() methods. Any idea again how to solve that?

I have this one also on the source code:

$base = new A();

So, the constructor should been run already, right?

Answer 1

You must call parent::__construct() in the chil class constructor, otherwise the parent constructor is not called and the property won’t recieve its value.