引导语：Ecshop 用户登录后，将喜欢的商品加入购物车，退出重新登录后，购物车的商品被清空了。下面的内容就是保存原购物车的商品不清空。

1.打开includes - > cls_session.php 文件，搜索如下代码，大概267行

 $this->db->query('DELETE FROM ' . $GLOBALS['ecs']->table('cart') . " WHERE session_id = '$this->session_id');

修改为

 $this->db->query('DELETE FROM ' . $GLOBALS['ecs']->table('cart') . " WHERE session_id = '$this->session_id' AND user_id = 0");

打开includes -> lib_main.php文件

搜索function update_user_info()这个方法，大概19行，在该函数内部末尾添加如下代码

/* 更新用户购物车，退出不清空购物车 */
    $sql = "UPDATE " .$GLOBALS['ecs']->table('cart'). " SET".
           " user_id = '" . $_SESSION['user_id'] . "'".
           " WHERE session_id = '" . SESS_ID . "'";
    $GLOBALS['db']->query($sql);
    $sql = "UPDATE " . $GLOBALS['ecs']->table('cart') . " SET".
           " session_id = '" . SESS_ID . "'".
           " WHERE user_id = '" . $_SESSION['user_id'] . "'";
    $GLOBALS['db']->query($sql);
    /* 删除购物车中已下架的商品 */
	$sql = "SELECT DISTINCT(c.goods_id) FROM " .$GLOBALS['ecs']->table('cart'). 
           " AS c left JOIN " .$GLOBALS['ecs']->table('goods'). 
           " AS g on c.goods_id = g.goods_id WHERE g.is_on_sale = 0 AND c.user_id = '" . $_SESSION['user_id'] . "'";
    $data = $GLOBALS['db'] ->getAll($sql);
    if($data){
		foreach ($data as $k=>$v){
            $sql = "DELETE FROM " .$GLOBALS['ecs']->table('cart'). " WHERE goods_id = '" . $v['goods_id'] . "'";
            $GLOBALS['db'] -> query($sql);
		}
    }