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我正在编写一个购物车并将我的数据存储在 $_SESSION 数组中，但想计算一个总数。在它下面是我认为可以做到这一点的代码，但它返回“1”而不是总数！

$total = array($_SESSION['qty'],$_SESSION['pr']);

/* 我会给你更多的代码...谢谢你的帮助！！这是我的 php 购物车的代码：

<?php

function item_list() { if(isset($_SESSION['qty'])){ $total = array($_SESSION['qty'],$_SESSION['pr']);

    foreach($_SESSION['qty'] as $key => $value)
    {?>
        <tr>
    <td align="center"><?php echo $_SESSION['item'][$key]; ?></td>
    <td align="center"><?php echo $value; ?></td>
    <td align="center"><?php echo $_SESSION['pr'][$key]; ?></td>
    <td align="center"><?php echo array_product($total); ?>
    </tr><?php 
    }
}

}

session_start();

if(isset($_POST['clear']) && ($_POST['clear'] == 'clear')) { session_destroy(); 未设置（$_SESSION['数量']）；未设置（$_SESSION['item']）；未设置（$_SESSION['pr']）；未设置（$_POST['数量']）；未设置（$_POST['item']）；未设置（$_POST['pr']）；}

if(!isset($_SESSION['qty'])) $_SESSION['qty'] = array(); if(!isset($_SESSION['item'])) $_SESSION['item'] = array(); if(!isset($_SESSION['pr'])) $_SESSION['pr'] = array();

如果（isset（$_POST['数量']））{

foreach($_POST['qty'] as $value)
{
    if(!$value == '') array_push($_SESSION['qty'], filter_var($value,

FILTER_SANITIZE_SPECIAL_CHARS)); } foreach($_POST['item'] as $key => $value) { if(!$_POST['qty'][$key] == '') array_push($_SESSION['item'], filter_var( $value, FILTER_SANITIZE_SPECIAL_CHARS)); } foreach($_POST['pr'] as $key => $value) { if(!$_POST['qty'][$key] == '') array_push($_SESSION['pr'], filter_var( $value, FILTER_SANITIZE_SPECIAL_CHARS)); }
}

?>

4

3 回答 3

1

这是构建购物车的一种奇怪方式，但以下是使用该结构的方法：

foreach($_SESSION['qty'] as $key => $value)
{
    $total = $_SESSION['qty'][$key] * $_SESSION['pr'][$key];
?>
    <tr>
<td align="center"><?php echo $_SESSION['item'][$key]; ?></td>
<td align="center"><?php echo $value; ?></td>
<td align="center"><?php echo $_SESSION['pr'][$key]; ?></td>
<td align="center"><?php echo $total; ?>
</tr><?php 
}

如果您想获得购物车的所有数量和成本的总和：

function getTotals()
{
    $total = array('qty' => 0, 'price' => 0);

    foreach($_SESSION['qty'] as $key => $qty)
    {
        $total['qty'] += $qty;
        $total['price'] += ($_SESSION['pr'][$key] * $qty)
    }

    return $total;
}

$total = getTotals();

echo $total['qty']; // output the total quantity of items
echo $total['price']; // output the total cost for all items and quantity

不过，我会推荐一个更好的结构，例如：

$_SESSION['cart']['items'] = array(
    array(
        'name' => 'Screwdriver',
        'price' => 5,
        'qty' => 2,
    ),
    array(
        'name' => 'Hammer',
        'price' => 10,
        'qty' => 1,
    )
);
于 2012-11-23T16:44:45.660 回答
0

根据您的购物车数组，它不能容纳多个产品，您必须像这样使用多维数组

$_SESSION['cart_items'] = array(
                array( "qty"=>5, "item"=>"tshirt", "pr"=>50.20), 
                array( "qty"=>2, "item"=>"Cell Phone", "pr"=>50.20),
                array( "qty"=>7, "item"=>"", "pr"=>50.20),      
               )

然后你可以这样写你的代码

function item_list()    
{

    foreach($_SESSION['cart_items'] as $item_array)
    {?>
        <tr>
    <td align="center">Item:<?php echo $item_array['item']; ?></td>
    <td align="center">Qty: <?php echo $item_array['qty']; ?></td>
    <td align="center">Price :<?php echo $item_array['pr']; ?></td>
    <td align="center">Total : <?php echo $item_array['qty'] * $item_array['pr']; ?>
    </tr><?php 
    }
}
于 2012-11-23T16:45:33.480 回答
0

您应该为自己创建一个Card能够从$_SESSION超全局导入/导出数据的类（或其他一些数组，如果您模拟它进行测试，测试$_SESSION可以是 akward），它能够轻松处理您的数据结构并可以计算总数， 也：

$cart = new Cart();
$cart->importFromArray($_SESSION);
// or:
$cart->importFromArray($_SESSION['cart']);

// later on:
$total = $cart->getTotal();

// somewhere else:
$cart->addItem(...);
...
$_SESSION['cart'] = $cart->exportToArray();

这将允许您随着时间的推移更轻松地更改代码。

于 2012-11-25T00:01:45.157 回答