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fullSolid.php
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fullSolid.php
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<?php
/* This example follows all five SOLID principles:
** Single Responsibility Principle:
* Each class has a single responsibility.
* PayPalProcessor and StripeProcessor classes are responsible for processing payments using their respective APIs,
* EmailNotificationService and SmsNotificationService classes are responsible for sending notifications via email and SMS,
* and PaymentService class is responsible for coordinating the payment processing and notification sending.
** Open-Closed Principle:
* The PaymentProcessorInterface and NotificationServiceInterface interfaces are open for extension
* but closed for modification.
* We can create new payment processors or notification services by implementing the interfaces
* without modifying the existing code.
** Liskov Substitution Principle:
* The PaymentService class works with any PaymentProcessorInterface and NotificationServiceInterface implementation,
* such as PayPalProcessor and EmailNotificationService, without knowing the specific implementation.
** Interface Segregation Principle:
* The PaymentProcessorInterface and NotificationServiceInterface are well-segregated,
* with each interface having a single responsibility.
** Dependency Inversion Principle:
* The PaymentService class depends on the PaymentProcessorInterface and NotificationServiceInterface abstractions,
* not on specific implementations.
*
* This allows us to inject different payment processors or notification services
* without changing the PaymentService class itself.
* */
interface PaymentProcessorInterface {
public function processPayment($amount);
}
class PayPalProcessor implements PaymentProcessorInterface {
private $apiKey;
public function __construct($apiKey) {
$this->apiKey = $apiKey;
}
public function processPayment($amount) {
// process payment using PayPal API
}
}
class StripeProcessor implements PaymentProcessorInterface {
private $apiKey;
public function __construct($apiKey) {
$this->apiKey = $apiKey;
}
public function processPayment($amount) {
// process payment using Stripe API
}
}
interface NotificationServiceInterface {
public function sendNotification($message);
}
class EmailNotificationService implements NotificationServiceInterface {
private $apiKey;
public function __construct($apiKey) {
$this->apiKey = $apiKey;
}
public function sendNotification($message) {
// send email notification using API
}
}
class SmsNotificationService implements NotificationServiceInterface {
private $apiKey;
public function __construct($apiKey) {
$this->apiKey = $apiKey;
}
public function sendNotification($message) {
// send SMS notification using API
}
}
class PaymentService {
private $paymentProcessor;
private $notificationService;
public function __construct(PaymentProcessorInterface $paymentProcessor, NotificationServiceInterface $notificationService) {
$this->paymentProcessor = $paymentProcessor;
$this->notificationService = $notificationService;
}
public function processPayment($amount) {
$this->paymentProcessor->processPayment($amount);
$this->notificationService->sendNotification("Payment processed successfully.");
}
}
// Usage
$paypalProcessor = new PayPalProcessor('123456789');
$emailNotificationService = new EmailNotificationService('987654321');
$paymentService = new PaymentService($paypalProcessor, $emailNotificationService);
$paymentService->processPayment(100);