Extending classes in PHP - Mini Project: Build & Apply

Extending Classes in PHP

📖 Scenario: You are creating a simple program to manage vehicles. You want to reuse common features of vehicles but also add special features for cars.

🎯 Goal: Build a PHP program that defines a base class Vehicle and a child class Car that extends Vehicle. You will add properties and methods step-by-step and then display the car details.

📋 What You'll Learn

Create a base class called Vehicle with a property $brand.

Create a child class called Car that extends Vehicle.

Add a property $model to the Car class.

Add a method getDetails() in Car that returns a string with brand and model.

Create an object of Car and print the details.

💡 Why This Matters

🌍 Real World

Extending classes helps reuse code and organize related features in programs like vehicle management systems.

💼 Career

Understanding class inheritance is essential for PHP developers building scalable and maintainable applications.

1

Create the base class Vehicle

Write a PHP class called Vehicle with a public property $brand set to the string "Toyota".

PHP

<?php

// Create class Vehicle with public property $brand set to "Toyota"
// Your code here

Need a hint?

Use class Vehicle { public string $brand = "Toyota"; } to create the class and property.

2

Create the Car class extending Vehicle

Add a class called Car that extends Vehicle. Inside Car, add a public property $model set to "Corolla".

PHP

<?php
class Vehicle {
    public string $brand = "Toyota";
}

// Create class Car that extends Vehicle
// Add public property $model set to "Corolla"
// Your code here

Need a hint?

Use class Car extends Vehicle { public string $model = "Corolla"; }.

3

Add getDetails() method to Car

Inside the Car class, add a public method called getDetails() that returns a string combining $this->brand and $this->model separated by a space.

PHP

<?php
class Vehicle {
    public string $brand = "Toyota";
}

class Car extends Vehicle {
    public string $model = "Corolla";

    // Add public function getDetails() that returns brand and model
    // Your code here
}

Need a hint?

Define public function getDetails(): string { return $this->brand . " " . $this->model; }.

4

Create Car object and print details

Create an object called $myCar of class Car. Then print the result of calling $myCar->getDetails().

PHP

brand . " " . $this->model;
    }
}

// Create object $myCar of class Car
// Print $myCar->getDetails()
// Your code here

Need a hint?

Use $myCar = new Car(); and print($myCar->getDetails());.