浅析php创建者模式

<?php
/**
 * 创建者模式
 */
//购物车
class ShoppingCart {
       //选中的商品
    private $_goods = array();
    //使用的优惠券
    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));
    }
}
//假如我们要还原购物车的东西，比如用户关闭浏览器后再打开时会根据cookie还原
$data = array(
       'goods' => array('衣服', '鞋子'),
       'tickets' => array('减10'),
);
//如果不使用创建者模式，则需要业务类里一步步还原购物车
// $cart = new ShoppingCart();
// foreach ($data['goods'] as $goods) {
//   $cart->addGoods($goods);
// }
// foreach ($data['tickets'] as $ticket) {
//   $cart->addTicket($ticket);
// }
// $cart->printInfo();
// exit;
//我们提供创建者类来封装购物车的数据组装
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();
?>