What is Interface and How to use it in Laravel

Hello Artisan,

In object-oriented programming, an interface is a contract that specifies a set of methods that a class must implement. It defines a common set of methods that multiple classes can implement, providing a way to ensure that these classes can be used interchangeably.

In Laravel, interfaces are used to define a set of methods that a class must implement in order to satisfy a contract. They provide a way to define and enforce the implementation of specific methods across multiple classes.

• Define the interface: Create a new interface by defining a set of methods that the implementing classes must implement. For example:

Here's an example of how to use an interface in Laravel:

<?php

namespace App\Interfaces;

interface PaymentGatewayInterface
{
    public function pay($amount);
    public function refund($transactionId, $amount);
}

• Implement the interface: Implement the interface by creating a new class that defines the methods specified in the interface. For example:

<?php

namespace App\Services;

use App\Interfaces\PaymentGatewayInterface;

class StripePaymentGateway implements PaymentGatewayInterface
{
    public function pay($amount)
    {
        // Implement payment gateway logic here
    }

    public function refund($transactionId, $amount)
    {
        // Implement refund logic here
    }
}

• Use the interface: Use the interface by creating a new instance of the class that implements the interface. For example:

<?php

namespace App\Http\Controllers;

use App\Interfaces\PaymentGatewayInterface;
use App\Services\StripePaymentGateway;

class PaymentController extends Controller
{
    public function makePayment(PaymentGatewayInterface $gateway)
    {
        $gateway->pay(100);
    }
}

// Usage:
$controller = new PaymentController();
$gateway = new StripePaymentGateway();
$controller->makePayment($gateway);

• In this example, the PaymentGatewayInterface interface defines the pay and refund methods that a payment gateway class must implement.

• The StripePaymentGateway class implements this interface and provides its own implementation for the pay and refund methods.

• Finally, the PaymentController class uses the PaymentGatewayInterface interface as a parameter type, which allows any class that implements this interface to be passed into the makePayment method.

• This provides a way to ensure that the passed-in class meets the requirements of the interface.

In this way we can use interfaces in laravel.

Thank You!!

Happy Reading... ❤️ 🦄