In this example, the PaymentGateway abstract class provides a common interface for different payment gateways.
abstract class PaymentGateway abstract public function processPayment($amount);
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Encapsulation is the practice of bundling data (properties) and methods (functions) that work on that data within a single unit—the class. Crucially, it involves restricting direct access to some of an object's components (using public , protected , or private visibility modifiers) to protect the integrity of the data.
Facades provide a "static" interface to classes that are available in the application's service container, offering a highly readable syntax without sacrificing testability. Accessing Laracasts Content: Legitimacy and Downloading object-oriented principles in php laracasts download
abstract class Notification protected string $message; public function __construct(string $message) $this->message = $message; abstract public function send(): void; class EmailNotification extends Notification public function send(): void // Code to send an email using $this->message Use code with caution. Polymorphism
// The Client Code function checkout(PaymentGateway $gateway, $amount) echo $gateway->pay($amount);
Understanding classes as blueprints and objects as tangible instances of those blueprints.
The series is structured into logical modules that build upon each other: Foundational Constructs : Covers the basics of as blueprints and In this example, the PaymentGateway abstract class provides
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. By using visibility modifiers (public, private, protected), a class signals to the outside world which internals should remain private, thereby protecting the object's state and improving its public API.
For many PHP developers, the journey begins with procedural code—writing simple scripts, connecting to databases, and echoing results. While effective for small tasks, this approach quickly becomes unmanageable as applications scale. This is where Object-Oriented Programming (OOP) enters the picture, transforming how we structure code, reuse logic, and manage complexity. Facades provide a "static" interface to classes that
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In this example, the area() method is overridden in the Circle and Rectangle classes.
Imagine you have a User class with a property $status . If you make it public, any code in your application can set $user->status = 'gibberish' . Encapsulation forces this data to go through a "gatekeeper" (a method) to ensure validity.
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: Learning when to compose objects rather than inheriting from them.