Methods and $this keyword in PHP - Mini Project: Build & Apply

Methods and $this keyword

📖 Scenario: Imagine you are creating a simple program to manage a car's details. You want to store the car's brand and model, and then show this information using a method inside a class.

🎯 Goal: You will build a PHP class called Car with properties for brand and model. Then, you will add a method called displayInfo that uses the $this keyword to show the car's brand and model.

📋 What You'll Learn

Create a class named Car with two public properties: brand and model

Create an object of the Car class

Assign the values "Toyota" to brand and "Corolla" to model

Add a method called displayInfo inside the Car class that prints the brand and model using $this

Call the displayInfo method on the object and print the output

💡 Why This Matters

🌍 Real World

Classes and methods with <code>$this</code> are used to organize data and behavior in real-world PHP applications like websites and tools.

💼 Career

Understanding how to use classes and the <code>$this</code> keyword is essential for PHP developers building maintainable and reusable code.

1

Create the Car class with properties

Create a class called Car with two public properties: brand and model.

PHP

<?php

// Create class Car with public properties brand and model
// Your code here

Need a hint?

Use class Car { } to create the class. Inside, declare public string $brand; and public string $model;.

2

Create a Car object and assign values

Create an object called $myCar from the Car class. Then assign "Toyota" to $myCar->brand and "Corolla" to $myCar->model.

PHP

<?php

class Car {
    public string $brand;
    public string $model;
}

// Create object $myCar and assign brand and model
// Your code here

Need a hint?

Create the object with $myCar = new Car();. Assign values using $myCar->brand = "Toyota"; and $myCar->model = "Corolla";.

3

Add displayInfo method using $this

Inside the Car class, add a public method called displayInfo that prints the car's brand and model using $this->brand and $this->model.

PHP

brand = "Toyota";
$myCar->model = "Corolla";

Need a hint?

Define the method with public function displayInfo() { }. Use echo "Brand: " . $this->brand . ", Model: " . $this->model; inside.

4

Call displayInfo method and print output

Call the displayInfo method on the $myCar object to print the car's brand and model.

PHP

brand . ", Model: " . $this->model . "\n";
    }
}

$myCar = new Car();
$myCar->brand = "Toyota";
$myCar->model = "Corolla";

// Call displayInfo method on $myCar
// Your code here

Need a hint?

Call the method with $myCar->displayInfo(); to print the details.