Belajar PHP OOP Part 1.14 : Constructor Overriding

• Karena constructor sama seperti function, maka constructor-pun bisa kita deklarasikan ulang di class child nya
• Sebenarnya di PHP, kita bisa meng-override function dengan arguments yang berbeda, namun sangat tidak disarankan
• Jika kita melakukan override function dengan arguments berbeda, maka PHP akan menampilkan WARNING
• Namun berbeda dengan constructor overriding, kita boleh meng-override dengan mengubah arguments nya, namun di rekomendasikan untuk memanggil parent constructor

 Mengubah Langsung argument nya di Method

class Manager
{
    var string $name;

    function sayHello(string $name): void
    {
        echo "Hi $name, my name is Manager $this->name" . PHP_EOL;
    }
}

class VicePresident extends Manager
{

    function sayHello(): void //Arguments di remove
    {
        echo "Hi , my name is VP $this->name" . PHP_EOL;
    }

}

<?php

require_once "data/Manager.php";

$manager = new Manager();
$manager->name ="Budi";
$manager->sayHello("Joko");

$vp= new VicePresident();
$vp->name="Eko";
$vp->sayHello(); //Arguments di remove

Constructor Overriding

<?php

class Manager
{
    var string $name;
    var string $title;

    public function __construct(string $name = "", string $title = "Manager")
    {
        $this->name = $name;
        $this->title = $title;
    }

    function sayHello(string $name): void
    {
        echo "Hi $name, my name is Manager $this->name" . PHP_EOL;
    }
}

class VicePresident extends Manager
{
    public function __construct(string $name = "")
    {
        //Tidak wajib tapi direkomendasikan
        parent::__construct($name, "VP");
    }

    function sayHello(string $name): void
    {
        echo "Hi $name, my name is VP $this->name" . PHP_EOL;
    }

}

<?php

require_once "data/Manager.php";

$manager = new Manager();
$manager->name ="Budi";
$manager->sayHello("Joko");

$vp= new VicePresident();
$vp->name="Eko";
$vp->sayHello("Joko");