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php-关于PHP的session调用的问题

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Release： 2016-06-02 11:28:30
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sessionphp

请教各位大神，下面PHP代码中"$_SESSION['cart'][$new]"的使用是什么语法？

<code>  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])) {      $_SESSION['cart'][$new]++;    } else {      $_SESSION['cart'][$new] = 1;    }</code>
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