购买数量达到优惠数量时享受的优惠价格；下面的功能是购物车总金额达到一定、商品款数达到一定或者某商品数量达到一定，那么就享受购物车里所有商品优惠价格；

在购物车文件里加上下面的函数，分别在加入、更新、删除购物车里加上函数名；

/*

*达到多少件商品优惠价格

*

*/

function mywe(){     

         $max=500;          //达到该金额就可以优惠

         $kss=4;           //达到该商品款数就可以优惠

         $num=2;            //以该数量的优惠价格  

         //目前最大金额

         $sql=”select sum(goods_price) from “.$GLOBALS[‘ecs’]->table(‘cart’).” where session_id='” . SESS_ID . “‘”;

         $m = $GLOBALS[‘db’]->getone($sql);

         $sql=”select goods_id,goods_price from “.$GLOBALS[‘ecs’]->table(‘cart’).” as c where goods_id in (select goods_id from “.$GLOBALS[‘ecs’]->table(‘cart’).” where  c.goods_id=goods_id) and session_id='” . SESS_ID . “‘”;

         $gids=$GLOBALS[‘db’]->getAll($sql);

         $ks=count($gids);//购物车的商品款数

         //echo($ks.'<br>’);print_r($gids);exit;

         if($ks>0){

                   foreach($gids as $value){

                            $goods_price1=0;

                            if($ks>=$kss || $m>=$max){

                                     $goods_price1 = get_final_price($value[‘goods_id’], $num, true);

                            }

                            $sql=”select sum(goods_number) as num from “.$GLOBALS[‘ecs’]->table(‘cart’).” where goods_id='”.$value[‘goods_id’].”‘ and session_id='” . SESS_ID . “‘ group by goods_id”;

                            $nums = $GLOBALS[‘db’]->getone($sql);

                            $goods_price2 = get_final_price($value[‘goods_id’], $nums, true);

                            if($goods_price1>=$goods_price2 || $goods_price1==0){

                                     $goods_price=$goods_price2;

                            }else{

                                     $goods_price=$goods_price1;

                            }

                            if($goods_price!=$value[‘goods_price’]){

                                     $sql = “UPDATE “.$GLOBALS[‘ecs’]->table(‘cart’).” SET goods_price = ‘$goods_price’ WHERE goods_id='”.$value[‘goods_id’].”‘ AND session_id='” . SESS_ID . “‘;”;

                                     $GLOBALS[‘db’]->query($sql);

                            }

                   }

         }

}

大家有什么好的方案请多多提点！

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