site/add_cart.php

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<?php
if(empty($_SESSION['username']))
{
    echo '<script>';
    echo 'alert("请您先登录.");';
    echo 'window.location.href = "dashboard/";';
    echo '</script>';
    die();
}
$sql = "SELECT * FROM products WHERE id='".$_GET['init']."'";
$p = $db->execute_dql($sql);
$p = $p[0];

if($_SESSION['userid']==$p['uid'])
{
    echo '<script>';
    echo 'alert("您不可以购买.");';
    echo 'window.history.back(-1);';
    echo '</script>';
    die();

}
if($_SESSION['usertype']==3)
{
    echo '<script>';
    echo 'alert("您不可以购买.");';
    echo 'window.history.back(-1);';
    echo '</script>';
    die();

}


$total = 0;
$items=0;
if(!isset($_GET['num']))
{
    $_GET['num'] = 1;
}
$cart = $_SESSION['cart'];

if(empty($cart))
{
    $_SESSION['cart'] = array(array($p,$_GET['num']));
    $items = 1;
    $total+=1*$p['price']*$_GET['num'];

}else{

    $cart[count($cart)] = array($p,$_GET['num']);
    $_SESSION['cart'] = $cart;
    $items = count($cart);
    foreach($cart as $c)
    {
        $total+=$c[0]['price']*$c[1]*1;
    }
}
$_SESSION['TotalCartMoney'] = $total;
$_SESSION['TotalCartNum'] = $items;
echo '<script>';