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php基础问题,会话变量 数组,请指点

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Release: 2016-06-23 13:56:02
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if($new)  {    //new item selected    if(!isset($_SESSION['cart']))     {      $_SESSION['cart'] = array(); //      $_SESSION['items'] = 0;      $_SESSION['total_price'] ='0.00';    }    if(isset($_SESSION['cart'][$new])) //这一句是什么意思??$new是一个传入的参数,该参数是一本书的isbm码,9787111262817,请问$_SESSION['cart'][$new] 是什么意思??这样会得出什么结果?能否详细描述下。感谢ing....      $_SESSION['cart'][$new]++;    else       $_SESSION['cart'][$new] = 1;
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回复讨论(解决方案)

??你能看懂??
$new='a';
$_SESSION['cart']=array(
'a'=>'xxx',
);

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