Facade Design Pattern

Facade/example_one.php

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+<?php
+####################################
+##### FACADE DESIGN PATTERN #######
+####################################
+class Cart
+{
+ /**
+ * Product added in cart
+ * @param $products
+ * @return void
+ */
+ public function addProducts($products)
+ {
+ echo "Product added in cart<br/>";
+ }
+
+ /**
+ * Checkout products
+ * @return void
+ */
+ public function getProducts()
+ {
+ echo "Checkout product<br/>";
+ }
+}
+
+class Order
+{
+ /**
+ * Process order
+ * @param $products
+ * @return void
+ */
+ public function process($products)
+ {
+ echo "Order processing<br/>";
+ }
+}
+
+class Payment
+{
+ /**
+ * Add additional charges
+ * @param $charge
+ * @return void
+ */
+ public function charge($charge)
+ {
+ echo "Include additional charge and calculate total charge<br/>";
+ }
+
+ /**
+ * Make payment and return success or failed
+ * @return string
+ */
+ public function makePayment()
+ {
+ echo "Redirect to payment site and make payment<br/>";
+ return 1; // 1 means success and 0 means failed
+ }
+}
+
+class Shipping
+{
+ /**
+ * Calculate and added shipping charge
+ * @return void
+ */
+ public function calculateCharge()
+ {
+ echo "Added shipping charge<br/>";
+ }
+
+ /**
+ * Ship products
+ * @return void
+ */
+ public function shipProducts()
+ {
+ echo "Ship this products<br/>";
+ }
+}
+
+class CustomerFacade
+{
+ /**
+ * Assign all classes instance
+ */
+ public function __construct()
+ {
+ $this->cart = new Cart;
+ $this->order = new Order;
+ $this->payment = new Payment;
+ $this->shipping = new Shipping;
+ }
+
+ /**
+ * Added to cart
+ * @return Cart
+ */
+ public function addToCart($products)
+ {
+ $this->cart->addProducts($products);
+ }
+
+ /**
+ * Checkout process
+ * @return void
+ */
+ public function checkout()
+ {
+ $products = $this->cart->getProducts();
+ }
+
+ /**
+ * Calculate charge, make payment and ship products
+ * @return void
+ */
+ public function makePayment()
+ {
+ $charge = $this->shipping->calculateCharge();
+ $this->payment->charge($charge);
+
+ $isCompleted = $this->payment->makePayment();
+
+ if ($isCompleted) {
+ $this->shipping->shipProducts();;
+ }
+ }
+}
+
+// Instantiate objects of facade class
+$customer = new CustomerFacade;
+
+// Product List
+$products = [
+ [
+ 'name' => 'Polo T-Shirt',
+ 'price' => 40,
+ ],
+ [
+ 'name' => 'Smart Watch',
+ 'price' => 400,
+ ]
+];
+
+// Add to cart
+$customer->addToCart($products);
+// Checkout
+$customer->checkout();
+// Make payment
+$customer->makePayment();

Facade/example_two.php

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+<?php
+####################################
+##### FACADE DESIGN PATTERN #######
+####################################
+class Cpu
+{
+ /**
+ * Run cpu
+ * @return void
+ */
+ public function run()
+ {
+ echo "Cpu starts to run<br/>";
+ }
+}
+
+class Memory
+{
+ /**
+ * Run memory
+ * @return void
+ */
+ public function run()
+ {
+ echo "Memory starts to run<br/>";
+ }
+}
+
+class Monitor
+{
+ /**
+ * Run monitor
+ * @return void
+ */
+ public function run()
+ {
+ echo "Monitor starts to run<br/>";
+ }
+}
+
+class ComputerFacade
+{
+ protected $cpu;
+ protected $memory;
+ protected $monitor;
+
+ /**
+ * Assign cpu, memory, monitor class instantiate
+ */
+ public function __construct()
+ {
+ $this->cpu = new Cpu();
+ $this->memory = new Memory();
+ $this->monitor = new Monitor();
+ }
+
+ /**
+ * Run cpu, memory, monitor
+ * @return void
+ */
+ public function run()
+ {
+ $this->cpu->run();
+ $this->memory->run();
+ $this->monitor->run();
+ }
+}
+
+// Instantiate facade class and run
+$computer = new ComputerFacade();
+$computer->run();