OOP (beneficial usage)

Question

for my question on how to use OOP in a beneficial way I assume as an example a BASKET to which its owner (Tom) having a certain ADDRESS (NY) can add ARTICLE

Answer 1

Both basket as well as bill could have a relation to a positions item - an object representing an ordered list of zero or more items with a count and price.

As such a list is an object of it's own it's easy to pass around:

$bill = new Bill($buyer, $address, $basket->getPositions());

However the printing of the bill should be done by the BillPrinter, because it's not the job of the bill to print itself:

$billPrinter = new BillPrinter($bill, $printerDevice);
$billPrinter->print();