Repository pattern in PHP - Mini Project: Build & Apply

Repository Pattern in PHP

📖 Scenario: You are building a simple PHP application to manage a list of books. To keep your code clean and organized, you want to use the Repository pattern. This pattern helps separate the data storage logic from the rest of your application.

🎯 Goal: Create a basic Repository pattern implementation in PHP to store and retrieve books. You will create a data array, a repository class, and use it to get all books.

📋 What You'll Learn

Create an array of books with exact titles and authors

Create a BookRepository class with a method to get all books

Use the repository to retrieve and print the list of books

💡 Why This Matters

🌍 Real World

The Repository pattern helps keep your PHP code organized by separating data access from business logic. This makes your code easier to maintain and test.

💼 Career

Many PHP frameworks and professional projects use the Repository pattern to manage data. Knowing this pattern is useful for backend development jobs.

1

Create the books data array

Create a PHP array called $books with these exact entries: ['title' => '1984', 'author' => 'George Orwell'], ['title' => 'To Kill a Mockingbird', 'author' => 'Harper Lee'], and ['title' => 'The Great Gatsby', 'author' => 'F. Scott Fitzgerald'].

PHP

<?php
// Create the books array with exact entries
// Your code here

Need a hint?

Use a PHP array with three associative arrays inside, each with keys title and author.

2

Create the BookRepository class

Create a PHP class called BookRepository with a private property $books to hold the books array. Add a constructor that accepts a parameter $books and assigns it to the property $this->books.

PHP

 '1984', 'author' => 'George Orwell'],
    ['title' => 'To Kill a Mockingbird', 'author' => 'Harper Lee'],
    ['title' => 'The Great Gatsby', 'author' => 'F. Scott Fitzgerald']
];

// Create the BookRepository class with private $books and constructor
// Your code here

Need a hint?

Define a class with a private property and a constructor that sets this property from the parameter.

3

Add a method to get all books

Inside the BookRepository class, add a public method called getAll() that returns the $books property.

PHP

 '1984', 'author' => 'George Orwell'],
    ['title' => 'To Kill a Mockingbird', 'author' => 'Harper Lee'],
    ['title' => 'The Great Gatsby', 'author' => 'F. Scott Fitzgerald']
];

class BookRepository {
    private array $books;

    public function __construct(array $books) {
        $this->books = $books;
    }

    // Add getAll() method to return $books
    // Your code here
}

Need a hint?

Write a public method that returns the private books property.

4

Use the repository and print all books

Create an instance of BookRepository called $repository using the $books array. Then, use $repository->getAll() to get all books and print each book's title and author in the format: Title: [title], Author: [author] on separate lines.

PHP

 '1984', 'author' => 'George Orwell'],
    ['title' => 'To Kill a Mockingbird', 'author' => 'Harper Lee'],
    ['title' => 'The Great Gatsby', 'author' => 'F. Scott Fitzgerald']
];

class BookRepository {
    private array $books;

    public function __construct(array $books) {
        $this->books = $books;
    }

    public function getAll(): array {
        return $this->books;
    }
}

// Create $repository and print all books
// Your code here

Need a hint?

Create the repository object and loop through the books returned by getAll(). Use echo to print each book's details.