把以下代码加到flow.php文件（165行），$result['confirm_type'] = !empty($_CFG['cart_confirm']) ? $_CFG['cart_confirm'] : 2;的上面

/* 取得优惠活动 */
$favourable_list = favourable_list($_SESSION['user_rank']);

// 自动把赠品添加到购物车
foreach($favourable_list as $v)
{
if(!$v['available']) continue;
/* 取得优惠活动信息 */
$act_id = $v['act_id'];
$favourable = favourable_info($act_id);

/* 检查购物车中是否已有该优惠 */
$cart_favourable = cart_favourable();
if (favourable_used($favourable, $cart_favourable))
{
continue;
}
$gift = array();
foreach($v['gift'] as $g)
{
$gift[] = $g['id'];
}

/* 赠品（特惠品）优惠 */
if ($favourable['act_type'] == FAT_GOODS)
{
/* 检查是否已在购物车 */
$sql = "SELECT goods_name" .
" FROM " . $ecs->table('cart') .
" WHERE session_id = '" . SESS_ID . "'" .
" AND rec_type = '" . CART_GENERAL_GOODS . "'" .
" AND is_gift = '$act_id'" .
" AND goods_id " . db_create_in($gift);
$gift_name = $db->getCol($sql);
if (!empty($gift_name))
{
continue;
}

/* 检查数量是否超过上限 */
$count = isset($cart_favourable[$act_id]) ? $cart_favourable[$act_id] : 0;
if ($favourable['act_type_ext'] > 0 && $count + count($gift) > $favourable['act_type_ext'])
{
continue;
}

/* 添加赠品到购物车 */
foreach ($favourable['gift'] as $g)
{
add_gift_to_cart($act_id, $g['id'], $g['price']);
}
}
}