A brief analysis of the PHP creator mode, a brief analysis of PHP creation_PHP tutorial

/**
*Creator Mode
​*/
//Shopping Cart
class ShoppingCart {
//Selected items
Private $_goods = array();
//Coupon used
Private $_tickets = array();
Public function addGoods($goods) {
                   $this->_goods[] = $goods;
}
Public function addTicket($ticket) {
                $this->_tickets[] = $ticket;
}
Public function printInfo() {
                    printf("goods:%s, tickets:%sn", implode(',', $this->_goods), implode(',', $this->_tickets));
}
}
//If we want to restore the contents of the shopping cart, for example, when the user closes the browser and opens it again, it will be restored based on cookies
$data = array(
        'goods' => array('clothes', 'shoes'),
        'tickets' => array('minus 10'),
);
//If you do not use the creator mode, you need to restore the shopping cart step by step in the business class
// $cart = new ShoppingCart();
// foreach ($data['goods'] as $goods) {
// $cart->addGoods($goods);
// }
// foreach ($data['tickets'] as $ticket) {
// $cart->addTicket($ticket);
// }
// $cart->printInfo();
// exit;
//We provide a creator class to encapsulate the data assembly of the shopping cart
class CardBuilder {
       private $_card;
Function __construct($card) {
                   $this->_card = $card;
}
function build($data) {
foreach ($data['goods'] as $goods) {
$this->_card->addGoods($goods);
              }
foreach ($data['tickets'] as $ticket) {
$this->_card->addTicket($ticket);
              }
}
function getCrad() {
                  return $this->_card;
}
}
$cart = new ShoppingCart();
$builder = new CardBuilder($cart);
$builder->build($data);
echo "after builder:n";
$cart->printInfo();
?>