2.6. Facade¶

 1<?php
 2
 3// Define the subsystems
 4class OrderVerification
 5{
 6    public function verifyOrder(int $orderId): bool
 7    {
 8        // Code to verify the order
 9        return true;
10    }
11}
12
13class PaymentProcessor
14{
15    public function processPayment(float $amount): bool
16    {
17        // Code to process the payment
18        return true;
19    }
20}
21
22class OrderFulfillment
23{
24    public function fulfillOrder(int $orderId): bool
25    {
26        // Code to fulfill the order
27        return true;
28    }
29}

 1<?php
 2
 3// Define the facade
 4class OrderFacade
 5{
 6    protected OrderVerification $verification;
 7    protected PaymentProcessor $payment;
 8    protected OrderFulfillment $fulfillment;
 9
10    public function __construct()
11    {
12        $this->verification = new OrderVerification();
13        $this->payment = new PaymentProcessor();
14        $this->fulfillment = new OrderFulfillment();
15    }
16
17    public function placeOrder(int $orderId, float $amount): bool
18    {
19        $verified = $this->verification->verifyOrder($orderId);
20
21        if (!$verified) {
22            return false;
23        }
24
25        $paid = $this->payment->processPayment($amount);
26
27        if (!$paid) {
28            return false;
29        }
30
31        $fulfilled = $this->fulfillment->fulfillOrder($orderId);
32
33        if (!$fulfilled) {
34            return false;
35        }
36
37        return true;
38    }
39}

 1<?php
 2
 3// Client code
 4$facade = new OrderFacade();
 5$orderId = 12345;
 6$amount = 99.99;
 7
 8if ($facade->placeOrder($orderId, $amount)) {
 9    echo "Order placed successfully.\n";
10} else {
11    echo "Failed to place order.\n";
12}