yii2购物车实现

1.商品列表中点击加入购物车，则跳转到购物车列表，效果如图所示：

视图代码goods/list.php中。代码如下：

<?php echo Html::a('加入购物车',['cart','id'=>$info['goods_id']])?>

控制器GoodsController.php中，开启session.

use yii\web\Session;
$session = new Session;
$session->open();

/**
 * 加入购物车
 */
public function actionCart($id){
   //获取添加到购物车的商品的信息
   $goods_model=new Goods();
   $good_info=$goods_model->findOne($id);
   //信息为空或者数量<0,则不存在要购买的商品,否则把要购买的商品添加到session中
   if(empty($good_info) || count($good_info)<0){
      exit("No Goods");
   }else{
      $good_info['num']=1;
      //判断购物车中是否已经存在该商品，存在的话数量叠加，
      if(isset($_SESSION["shoplist"][$good_info['goods_id']])){
         //若存在数量叠加
         $num=$_SESSION["shoplist"][$good_info['goods_id']]['num'];
         $num++;
         $_SESSION["shoplist"][$good_info['goods_id']]['num']=$num;
         //$_SESSION["shoplist"][$good_info['goods_id']]['num'] ++;
      }else{
         //若不存在，作为新购买的商品添加到购物车中
         $_SESSION["shoplist"][$good_info['goods_id']]=$good_info;
      }
//       $_SESSION['shoplist'][]=$good_info;
      return $this->redirect('./index.php?r=cart/list');
   }
}

2.购物车列表页：

use yii\web\Session;

$session = new Session;
$session->open();

/**
 * 购物车列表
 */
public function actionList(){
   $cart_list=$_SESSION['shoplist'];
   return $this->render('list',['cart_list'=>$cart_list]);
}

3.删除购物车中的商品和清空购物车

视图cart/list.php中
<?php echo Html::a('删除',['delete','id'=>$info['goods_id']],['onclick'=> 'return confirm("Confirm to delete?")'])?>

控制器CartController.php中
/**
 * 购物车中的单一商品删除
 */
public function actionDelete(){
   $cart_list=$_SESSION['shoplist'];
    //判断是删除一个商品还是请空购物车
   if($_GET['id']){
      //从session中删除指定的商品信息
      unset($_SESSION["shoplist"][$_GET['id']]);
   }else{
      //清空session中商品,清空购物车
      unset($_SESSION["shoplist"]);
   }
   return $this->redirect("./index.php?r=cart/list");
}