shop

/*
 * Compatility: PHP 5.3+
 * 
 * Class methods
 * -----------------------------------------------------------------------------
 * addItem() - Add item or increase quantity
 * countCartItems() - Count number of items in cart for current user
 * delItem() - Del item or decrease quantity
 * delUserCart() - Delete all the items in the cart of actual user
 * mergeCart() - Merge user stored items with actual cart
 * readItem() - Return object with item info
 * readCart() - Return object with all the items in the cart of actual user
 * readCartIDs() - Return array with all the item IDs in the cart of actual user
 * 
 */