Parent class properties are null in child class in php

Question

I have two classes in PHP when I inherit one class from another the properties of parent class are available in child class but their value is null.

Parent Class:

    <?php
class Parent_class {
  public $foo;
  public $bar;

  public function __construct(){
    $this->foo = 'This is foo';
    $this->bar = new self();
  }

  public function getFoo(){
    echo 'Foo is: ' .$this->foo;
  }

  public function getBar(){
    echo 'Bar is :' .$this->bar;
  }
}

Child Class :

<?php
    require './class1.php';
    class Child_class extends Parent_class{
      public function __construct(){
        echo $this->foo;
        print_r($this->bar);
        var_dump(get_object_vars($this));
      }
    }

    $child = new Child_class();
    $child->getFoo();
    $child->getBar();

Result :

 array(2) {
  ["foo"]=>
  NULL
  ["bar"]=>
  NULL
}

Foo is: Bar is :

So, How can I get those value in child class to. Did I made something wrong here?

Answer 1

You actually override you parent constructor. Try this

  public function __construct()
{
    parent::__construct();
    echo $this->foo;
    print_r($this->bar);
}

Or better if you will output your data via some method, not constructor.