Object-oriented Principles In Php Laracasts Download Guide
Even with great tutorials, developers make OOP mistakes:
Polymorphism can be achieved through method overriding or method overloading. Here's an example:
class Shape
public function area()
// ...
class Circle extends Shape
public function area($radius)
return pi() * $radius * $radius;
class Rectangle extends Shape
public function area($width, $height)
return $width * $height;
In this example, the area() method is overridden in the Circle and Rectangle classes.
Laracasts: A Valuable Resource for Learning OOP in PHP
Laracasts is a popular video tutorial platform that offers a wide range of courses on PHP and Laravel development. The platform provides an excellent resource for learning object-oriented principles in PHP, with a focus on practical, real-world examples.
Some popular Laracasts courses for learning OOP in PHP include:
Conclusion
In conclusion, object-oriented principles are essential for writing maintainable, flexible, and scalable code in PHP. By applying encapsulation, abstraction, inheritance, and polymorphism, you can create more robust and reusable code. Laracasts provides a valuable resource for learning OOP in PHP, with a range of courses and tutorials to help you improve your skills. Whether you're a beginner or an experienced developer, Laracasts has something to offer.
Download Your Free Laracasts Course
As a special treat, you can download a free Laracasts course on object-oriented programming in PHP. Simply sign up for a free Laracasts account, and you'll gain access to a range of free courses and tutorials.
Happy coding!
The Tale of the Eloquent Repository
Once upon a time, in a land of tangled code and spaghetti-like architecture, there lived a young PHP developer named Alex. Alex was tasked with building a complex web application using the Laravel framework. As the project grew, Alex began to feel overwhelmed by the sheer amount of code and the tight coupling between different parts of the application. object-oriented principles in php laracasts download
One day, while browsing through Laracasts, Alex stumbled upon a video series titled "Object-Oriented Principles in PHP". The videos were presented by the wise and experienced teacher, Laracasts' very own, Jeffrey Way.
Intrigued, Alex started watching the videos and discovered the magic of object-oriented programming (OOP) principles. Jeffrey explained how to apply the Single Responsibility Principle (SRP), Open-Closed Principle (OCP), Liskov Substitution Principle (LSP), Interface Segregation Principle (ISP), and Dependency Inversion Principle (DIP) to write cleaner, more maintainable code.
Inspired, Alex decided to apply these principles to the project. The first step was to refactor the existing code to use repositories, which would encapsulate the data access logic. Alex created an EloquentRepository class that implemented an interface, defining the basic CRUD operations.
// Repository interface
interface RepositoryInterface
public function all();
public function find($id);
public function create(array $data);
public function update(array $data, $id);
public function delete($id);
// Eloquent repository implementation
class EloquentRepository implements RepositoryInterface
protected $model;
public function __construct(Model $model)
$this->model = $model;
public function all()
return $this->model->all();
public function find($id)
return $this->model->find($id);
// ... other methods
Next, Alex created concrete repository classes that extended the EloquentRepository, such as UserRepository and ProductRepository. These classes could then be used throughout the application, decoupling the business logic from the data access layer.
// User repository
class UserRepository extends EloquentRepository
public function __construct(User $model)
parent::__construct($model);
public function getAdmins()
return $this->model->where('is_admin', true)->get();
As Alex continued to apply OOP principles, the codebase became more modular, flexible, and easier to maintain. The application was now composed of loosely coupled objects, each with a single responsibility.
The benefits were numerous:
Alex's colleagues were amazed at the transformation and soon adopted the same principles in their own projects.
The moral of the story is that by applying object-oriented principles, such as those explained in the Laracasts video series, you can write more maintainable, scalable, and flexible code. This will make your life as a developer easier and your applications more robust.
Download the code: You can download the example code used in this story from the Laracasts GitHub repository: https://github.com/laracasts/object-oriented-principles
Watch the video series: Object-Oriented Principles in PHP on Laracasts: https://laracasts.com/series/object-oriented-principles-in-php
The Laracasts course Object-Oriented Principles in PHP is a foundational series designed to bridge the gap between procedural and object-oriented programming (OOP). While Laracasts typically provides a "Download" button for paid subscribers on individual episode pages, you can access the full curriculum and episodes directly through the official Laracasts Series Page. Course Overview
This beginner-level series, approximately 1 hour and 33 minutes long, covers core concepts by applying them to real-world PHP scenarios. It is available in two versions: Even with great tutorials, developers make OOP mistakes:
2024 Edition: The updated version focusing on modern PHP practices.
Original Edition: The classic version released in early 2020. Syllabus & Key Lessons
The 2024 edition includes 10 episodes that guide you from basic constructs to complex abstractions:
Classes: Reviewing the fundamental structure of a PHP class.
Objects: Representing domain pieces through readable and flexible objects.
DTOs, Types, and Static Analysis: Implementing Data Transfer Objects for better type safety.
Dependencies & Interfaces: Understanding how objects interact and rely on one another.
Inheritance & Abstract Classes: Organizing code hierarchy and shared behaviors.
Interfaces as Feature Filters: Using interfaces to define specific capabilities.
Encapsulation & Visibility: Hiding internal data to protect object state.
Property Hooks: Modern PHP techniques for managing getters and setters.
Object Composition: Learning when to compose objects rather than inheriting from them. In this example, the area() method is overridden
Workshop: A practical application of all learned principles. How to Access & Download
Streaming: You can watch all episodes on Laracasts with a valid subscription.
Downloading: Subscribers often have access to a Download link located on the sidebar or under the video player for each episode for offline viewing.
Supplemental Resources: Community-maintained summaries and lesson notes can sometimes be found on GitHub to aid your learning.
com/topics/object-oriented-programming">PHP design patterns next? Object-Oriented Principles in PHP - Laracasts
Depend on abstractions, not concretions.
Dependency Injection is perhaps the most critical concept for building modern, testable PHP applications (and is the backbone of Laravel).
The Problem: In procedural code, if a class needs a database connection, it often creates it itself:
class UserController
public function index()
// BAD: The controller is tightly coupled to the Database class.
$db = new DatabaseConnection();
$users = $db->fetchAll('users');
Why is this bad? If you want to change your database driver or write a test for this controller using a fake database, you cannot do it easily.
The Solution (Dependency Injection): Instead of asking for the tool inside the function, you require it to be passed in (injected).
class UserController
protected $db;
// The dependency is injected via the constructor
public function __construct(DatabaseConnection $db)
$this->db = $db;
public function index()
return $this->db->fetchAll('users');
Now, UserController is not responsible for creating the database connection. It simply demands one. This makes your code decoupled and easy to test.
Laracasts offers an excellent series of tutorials on OOP in PHP, covering the following topics:
