if want to call parent class constructor in php

1<?php
2/**
3 *Inheritance:  It means accessing property of parent class from child class.
4 * 
5 * */
6class Animal
7{
8    function __construct()
9    {
10        echo '<br>construct1';
11    }
12    function fun1() 
13    {
14        echo '<br>fun1';
15    }
16}
17class Dog extends Animal
18{
19    function __construct()
20    {
21        // if want to call parent class constructor 
22        parent::__construct();
23        echo '<br>construct2';
24    }
25    function fun1()
26    {
27        echo '<br>Dog class function called';
28    } 
29}
30$obj = new Dog();
31$obj ->fun1();
32?>