<?php class Cart { const PRICE_BUTTER = 1.00; const PRICE_MILK = 3.00; const PRICE_EGGS = 6.95; protected $products = array(); public function add($product, $quantity) { $this->products[$product] = $quantity; } public function getQuantity($product) { return isset($this->products[$product]) ? $this->products[$product] : FALSE; } public function getTotal($tax) { $total = 0.00; $callback = function ($quantity, $product) use ($tax, &$total) { $pricePerItem = constant(__CLASS__ . "::PRICE_" . strtoupper($product)); $total += ($pricePerItem * $quantity) * ($tax + 1.0); }; array_walk($this->products, $callback); return round($total, 2); } } $my_cart = new Cart; // Add some items to the cart $my_cart->add('butter', 1); $my_cart->add('milk', 3); // Print the total with a 5% sales tax. print $my_cart->getTotal(0.05) . "\n"; // The result is 54.29 ?>
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