if 语句选择开关语句


if statement selects switch statement

我希望这是有道理的。现在,我正在使用以下代码将复选框检查的数量相加,并根据该数字获得运费。这只能让我获得一个运费(地面)。我知道想要添加多个运输选项,所以我需要添加另一组开关/案例语句。

//Add up club totals for shipping
            $clubTotal = array(
                            $driversChecked,
                            $hybridsChecked,
                            $woodsChecked,
                            $boxesChecked,
                            $wedgesChecked,
                            );  
            //see what shipping was picked
            $shippingChoice = $_POST['ShipMethod'];
            //Figure out ground shipping
            if (array_sum($clubTotal))
            {
                switch(array_sum($clubTotal))
                {
                    case 6:
                        $shippingCost =  15.99 ;
                        break ;
                    case 7:
                    case 8:
                        $shippingCost =  16.99 ;
                        break ;
                    case 9:
                    case 10:
                        $shippingCost =  17.99 ;
                        break ;
                    case 11:
                    case 12:
                        $shippingCost =  18.99 ;
                        break ;
                    case 13:
                        $shippingCost =  19.99 ;
                    break ;
                    case 14:
                        $shippingCost =  20.99 ;
                    break ;
                    case 15:
                        $shippingCost =  21.99 ;
                    break ;
                    case 16:
                        $shippingCost = 22.99;
                    break ;
                    default:
                        $shippingCost = 14.99;
                        break ;
                }
            }

如果$shippingChoice = $_POST['ShipMethod'];正在获取我的 ship 方法,我如何使用它来选择要使用的开关/case 语句。就像如果$shippingChoice返回"ground"的值一样,它将使用我当前的开关/case 语句。如果它返回"2 天",它将使用我将做出的另一个开关/案例语句。

你想要这样的东西吗?为其他运输方式添加子阵列。

$shippingCostData = array(
    'ground' => array(
        6 => 15.99,
        7 => 16.99,
        8 => 16.99,
        9 => 17.99,
        10 => 17.99,
        11 => 18.99,
        12 => 18.99,
        13 => 19.99,
        14 => 20.99,
        15 => 21.99,
        16 => 22.99,
        'default' => 14.99,
    ),
);
$method = 'ground';
$clubTotalSum = array_sum($clubTotal);
$shippingCost = (isset($shippingCostData[$method][$clubTotalSum]) ? $shippingCostData[$method][$clubTotalSum] : $shippingCostData[$method]['default']);

您也可以使用类似的东西来过滤运输方式以确保其有效。

$method = (isset($shippingCostData[$_POST['shippingMethod']]) ? $_POST['shippingMethod'] : key($shippingCostData));

您应该以另一种在运行时更具延展性的形式定义运费。例如:

$costs = [
    1 => 14.99, // 1 or more = 14.99
    6 => 15.99, // 6 or more
    7 => 16.99,
    9 => 17.99,
];

然后,您可以编写一个函数,该函数采用数字和成本数组并返回成本:

function calculateCost($items, $costs) {
    ksort($costs); // just to be on the safe side
    $result = reset($costs);
    foreach($costs as $number => $cost) {
        if ($number > $items) break;
        $result = $cost;
    }
    return $result;
}

完成此操作后,可以轻松保留多个成本数组并转发到所需的一个,例如

$costs = [
    'ground' => [
        1 => 14.99,
        6 => 15.99,
    ],
    'air' => [
        1 => 24.99,
        6 => 25.99,
    ],
];
$shippingChoice = $_POST['ShipMethod'];
$cost = calculateCost(array_sum($clubTotal), $costs[$shippingChoice]);

您可以轻松地将其扩展到任意数量的运输方式。