php cookie 购物车原理

用php数组和cookie实现购物车功能,实现的方法是:把cookie存入array,对array进行增加、删除、修改操作,array中的每一组记录都是一个商品的信息(个数,价格等)<br /> <br /> 解决购物车的思路是用cookie记录一个二维数组。一维代表每一个商品,二维包含了商品的id,商品的数量...等可以自行增加,反正都是二维了,自己愿意带多少个商品属性就加上去。<br /> <br /> 对购物车里商品的操作一般有以下几个:<br /> 添加商品,修改商品数量,删除商品,清空购物车。<br /> 这几个操作都是针对cookie的。每次把cookie中的数组取出来,增加、修改、删除一番,再记录到cookie中。至于清空购物车,那就更简单了,直接设置同名的cookie为空就可以了。 <br /> 具体代码如下:<br /> //加入购物车 <br /> function addcart($goods_id,$goods_num){ <br /> $cur_cart_array = unserialize(stripslashes($_COOKIE['shop_cart_info'])); <br /> if($cur_cart_array==&quot;&quot;){ <br /> $cart_info[0][] = $goods_id; <br /> $cart_info[0][] = $goods_num; <br /> setcookie(&quot;shop_cart_info&quot;,serialize($cart_info)); <br /> }elseif($cur_cart_array&lt;&gt;&quot;&quot;){ <br /> //返回数组键名倒序取最大 <br /> $ar_keys = array_keys($cur_cart_array); <br /> rsort($ar_keys); <br /> $max_array_keyid = $ar_keys[0]+1; <br /> //遍历当前的购物车数组 <br /> //遍历每个商品信息数组的0值,如果键值为0且货号相同则购物车存在相同货品 <br /> foreach($cur_cart_array as $goods_current_cart){ <br /> foreach($goods_current_cart as $key=&gt;$goods_current_id){ <br /> if($key == 0 and $goods_current_id == $goods_id){ <br /> echo &quot;&lt;script language=javascript&gt;&quot;; <br /> echo &quot;if(confirm('购物车已经有该商品,继续购物按----确定!查看购物车按----取消!'))&quot;; <br /> echo &quot;{history.go(-1)}&quot;; <br /> echo &quot;else{window.location.href='xqs_cart.php'}&quot;; <br /> echo &quot;&lt;/script&gt;&quot;; <br /> exit(); <br /> } <br /> } <br /> } <br /> $cur_cart_array[$max_array_keyid][] = $goods_id; <br /> $cur_cart_array[$max_array_keyid][] = $goods_num; <br /> setcookie(&quot;shop_cart_info&quot;,serialize($cur_cart_array)); <br /> } <br /> } <br /> //从购物车删除 <br /> function delcart($goods_array_id){<br /> $cur_goods_array = unserialize(stripslashes($_COOKIE['shop_cart_info'])); <br /> //删除该商品在数组中的位置 <br /> unset($cur_goods_array[$goods_array_id]); <br /> setcookie(&quot;shop_cart_info&quot;,serialize($cur_goods_array)); <br /> }<br /> //修改购物车货品数量 <br /> function update_cart($up_id,$up_num,$goods_ids){ <br /> //先清空cookie,以便重新设置,传递过来三个数组参数 1数组的标识 2商品数量数组 3商品编号数组 <br /> //如果不清空cookie则无法处理数量为零的商品 <br /> setcookie(&quot;shop_cart_info&quot;,&quot;&quot;); <br /> foreach($up_id as $song){ <br /> //先返回数组当前单元;再把指针向下移动一个位置 <br /> $goods_nums = current($up_num); <br /> $goods_id = current($goods_ids); <br /> next($up_num); <br /> next($goods_ids); <br /> //当商品数量为空的时候,注销此处的数组值并用continue 2 语句避开下面的操作,继续做foreach循环 <br /> while($goods_nums == 0){ <br /> unset($song); <br /> continue 2; <br /> } <br /> $cur_goods_array[$song][0] = $goods_id; <br /> $cur_goods_array[$song][1] = $goods_nums; <br /> } <br /> setcookie(&quot;shop_cart_info&quot;,serialize($cur_goods_array)); <br /> }
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