Online PHP editor | output for SOpYf

<?php class Product { protected $price; protected $discount; public function getPrice() { return $this->price->getValue(); } public function setPrice($price, $type) { $this->price = new Price($price); $this->price->setType($type); } public function getDiscount() { return $this->discount->getValue(); } public function setDiscount($discount, $type) { $this->discount = new Discount($discount); $this->discount->setType($type); } } class Price { protected $type; // 0 - one-off price, 1 - monthly price, 2 - combination of previous two; protected $value; function __construct($value) { if (is_numeric($value)) { $this->value = round(floatval($value), 2); } else { $this->value = 0; } } public function getType() { return $this->type; } public function setType($type) { if (is_numeric($type) && in_array(intval($type), array(0, 1, 2))) { $this->type = intval($type); } else { $this->type = 0; } } public function getValue() { return $this->value; } } class Discount extends Price{} class Shopcart { protected $shopping_list; function __construct($products) { $this->shopping_list[] = $products; } public function getTotalPrice() { $cost = 0; foreach ($this->shopping_list as $item) { $cost += $item->getCost(); } return $cost; } }