__construct and __destruct in PHP - Mini Project: Build & Apply

Using __construct and __destruct in PHP Classes

📖 Scenario: Imagine you are creating a simple PHP class to represent a Book in a library system. You want to set the book's title and author when you create the book object, and you want to display a message when the book object is removed from memory.

🎯 Goal: Build a PHP class called Book that uses __construct to set the title and author when a new book is created, and uses __destruct to print a message when the book object is destroyed.

📋 What You'll Learn

Create a class named Book with two properties: title and author.

Add a __construct method that takes two parameters: $title and $author, and sets the class properties.

Add a __destruct method that prints: "Destroying book: [title] by [author]".

Create an instance of Book with title "1984" and author "George Orwell".

Print the book's title and author after creating the object.

💡 Why This Matters

🌍 Real World

Constructors and destructors help manage resources and setup/cleanup tasks automatically when objects are created and destroyed, useful in many PHP applications like web development.

💼 Career

Understanding these magic methods is important for PHP developers to write clean, efficient, and maintainable object-oriented code.

1

Create the Book class with properties

Create a PHP class called Book with two public properties: $title and $author.

PHP

<?php

// Create class Book with public properties $title and $author
# Your code here

Need a hint?

Use class Book { public string $title; public string $author; } to define the class and properties.

2

Add the __construct method

Add a __construct method inside the Book class that takes two parameters: $title and $author. Inside the method, set the class properties $this->title and $this->author to these parameters.

PHP

<?php

class Book {
    public string $title;
    public string $author;

    // Add __construct method here
    # Your code here
}

Need a hint?

Define public function __construct(string $title, string $author) and assign parameters to properties.

3

Add the __destruct method

Add a __destruct method inside the Book class that prints the message: "Destroying book: [title] by [author]" using echo. Use $this->title and $this->author to insert the values.

PHP

title = $title;
        $this->author = $author;
    }

    // Add __destruct method here
    # Your code here
}

Need a hint?

Use public function __destruct() and inside it use echo with the message including $this->title and $this->author.

4

Create a Book object and print its details

Create a new Book object called $book with title "1984" and author "George Orwell". Then print the book's title and author in the format: "Title: 1984, Author: George Orwell" using echo.

PHP

title = $title;
        $this->author = $author;
    }

    public function __destruct() {
        echo "Destroying book: {$this->title} by {$this->author}\n";
    }
}

// Create Book object and print details
# Your code here

Need a hint?

Create the object with new Book("1984", "George Orwell") and print the details with echo.