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用session兑现购物车

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Release: 2016-06-13 11:16:51
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用session实现购物车
用session实现购物车,我是准备如果点放入购物车,则将一个商品的信息当成数组的一项插入$arr数组,
最后这个数组是一个二维数组,存放了所有购买的信息,
那么如果商品已经购买过,我怎么去判断并且只是将它的pdnum增加1,而不插入新项呢,
这段代码组织不来,谁帮忙下。。
$arr=array(array("pdname"=>"xx","pdprice"=>12,"pdnum"=>1),array("pdname"=>"yy","pdprice"=>22,"pdnum"=>1))
?>


------解决方案--------------------
为什么要用二维数组呢?
用一维的不是更简单吗?
商品名(或货号) => 数量
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