How to implement property inheritance?

Question

PHP

There are two classes: Parent and Child. Child will inherit the properties and methods of the parent. The parent has one property that is initialized when the class object is created. Later, in the parent, I create a "child" object.

class Parent {
  protected $var = 0;

  public function __construct($var=100) {
    $this->var = $var;
  }

  protected function say() {
    echo $this->var;
  }
}
class Child extends Parent {
  public function __construct() {
    $this->say();
  }
}

In general, when creating an object of the Child class, 0 is displayed, but 100 is needed.

Answer 1

Call the constructor of the parent class in the constructor of the child class.