<?
	session_start();

	class cart {
		private $items;
		function __construct() { // init
			$this->items = array();
		}
		function add($id,$amount,$price,$pages){
			$this->items[$id]['amount'] += $amount;
			$this->items[$id]['price'] = $price;
			$this->items[$id]['pages'] = $pages;
		}
		function remove($id){
			unset($this->items[$id]);
		}
		function update($id,$what,$val){
			$this->items[$id][$what] = $val;
		}
		function save(){
			$_SESSION['cart'] = $this;
		}
		function items(){
			return $this->items;
		}

		public static saveToDB($cart) {
			$query = sprintf("INSERT INTO Carts (timeCreated, cartObject) VALUES(UNIX_TIMESTAMP(), '%s')", mysql_real_escape_string(serialize($cart)));
			mysql_query($query);
			return mysql_insert_id();
		}

		public static loadFromDB($id) {
			$query = sprintf("SELECT cartObject FROM Carts WHERE ID = %d", $id);
			$data = mysql_fetch_assoc(mysql_query($query));
			return unserialize($data['cartObject']);
		}
	}
?>