PHP代码如何使用if-else

我的问题是，东京的目的地是否为每个至少住5晚的旅行者提供200美元的折扣

    if($destination == "Barcelona")
    {
    $airFare = 875;
    $perNight = 85;
    }

    else if($destination == "Cairo")
    {
    $airFare = 950;
    $perNight = 98;
    }

    else if($destination == "Rome")
    {
    $airFare = 875;
    $perNight = 110;
    }

    else if($destination == "Santiago")
    {
    $airFare = 820;
    $perNight = 85;
    }

    elseif($destination == "Tokyo")
    {
    $airFare = 1575;
    $perNight = 240;        
    }


    $tickets = $numTravelers * $airFare;
    $hotel = $numTravelers * $numNights * $perNight;
    $totalCost = $tickets + $hotel;

*我不能在这里更改任何代码，只需要添加它就可以获得200美元的折扣，如果你要去东京住5晚！

        if($destination == "Barcelona")
        {
            $airFare = 875;
            $perNight = 85;
        }

        else if($destination == "Cairo")
        {
            $airFare = 950;
            $perNight = 98;
        }

        else if($destination == "Rome")
        {
            $airFare = 875;
            $perNight = 110;
        }

        else if($destination == "Santiago")
        {
            $airFare = 820;
            $perNight = 85;
        }

        elseif($destination == "Tokyo")
        {
            $airFare = 1575;
            $perNight = 240;        
        }

        $discount = ($destination == "Tokyo" && $numNight == 5)? 200 : 0; // condition is here
        $tickets = $numTravelers * $airFare;
        $hotel = $numTravelers * $numNights * $perNight;
        $totalCost = $tickets + $hotel - $discount;
    ?>

如果我输入1名乘客到东京5晚，价值必须是2575美元

另外，我必须使用嵌套的If或复合布尔表达式！ 谢谢你的帮助

这是我的代码我如何加起来的问题，以获得200折扣在此代码？目的地在东京，至少说每人5晚可享受200折优惠

试试这段代码

 $subtotal=0;

elseif($destination == "Tokyo")
    {
    $airFare = 1575;
    $perNight = 240; 
      if($numNights >= 5){
        $subtotal= ($perNight*numNights)-200;
      }else{
        $subtotal= ($perNight*numNights)-200;
      }       
    }

$tickets = $numTravelers * $airFare;
    $hotel = $numTravelers * $numNights * $perNight;

        if($destination == "Barcelona")
        {
            $airFare = 875;
            $perNight = 85;
        }

        else if($destination == "Cairo")
        {
            $airFare = 950;
            $perNight = 98;
        }

        else if($destination == "Rome")
        {
            $airFare = 875;
            $perNight = 110;
        }

        else if($destination == "Santiago")
        {
            $airFare = 820;
            $perNight = 85;
        }

        elseif($destination == "Tokyo")
        {
            $airFare = 1575;
            $perNight = 240;        
        }

        $discount = ($destination == "Tokyo" && $numNight == 5)? 200 : 0; // condition is here
        $tickets = $numTravelers * $airFare;
        $hotel = $numTravelers * $numNights * $perNight;
        $totalCost = $tickets + $hotel - $discount;
    ?>

改为：

您应该在Tokyo的代码中添加另一个IF语句。现在，假设您已声明$discount=200和$nights变量。使用以下命令：

elseif($destination == "Tokyo")
    {
    $airFare = 1575;
    $perNight = 240;
if($nights >= 5){
    $total = ($airFare + $perNight) - $discount;   
    }
    }

        if($destination == "Barcelona")
        {
            $airFare = 875;
            $perNight = 85;
        }

        else if($destination == "Cairo")
        {
            $airFare = 950;
            $perNight = 98;
        }

        else if($destination == "Rome")
        {
            $airFare = 875;
            $perNight = 110;
        }

        else if($destination == "Santiago")
        {
            $airFare = 820;
            $perNight = 85;
        }

        elseif($destination == "Tokyo")
        {
            $airFare = 1575;
            $perNight = 240;        
        }

        $discount = ($destination == "Tokyo" && $numNight == 5)? 200 : 0; // condition is here
        $tickets = $numTravelers * $airFare;
        $hotel = $numTravelers * $numNights * $perNight;
        $totalCost = $tickets + $hotel - $discount;
    ?>

---

我尝试尽可能少地修改您的代码，如下所示： 编辑为仅在东京停留5晚将获得一次性200美元折扣

        if($destination == "Barcelona")
        {
            $airFare = 875;
            $perNight = 85;
        }

        else if($destination == "Cairo")
        {
            $airFare = 950;
            $perNight = 98;
        }

        else if($destination == "Rome")
        {
            $airFare = 875;
            $perNight = 110;
        }

        else if($destination == "Santiago")
        {
            $airFare = 820;
            $perNight = 85;
        }

        elseif($destination == "Tokyo")
        {
            $airFare = 1575;
            $perNight = 240;        
        }

        $discount = ($destination == "Tokyo" && $numNight == 5)? 200 : 0; // condition is here
        $tickets = $numTravelers * $airFare;
        $hotel = $numTravelers * $numNights * $perNight;
        $totalCost = $tickets + $hotel - $discount;
    ?>

这就是我给你的建议。你可能会发现它非常不同：

创建一个函数，而不是一个冗长的elseifs。也可以考虑开关情况，但我发现简单地使用数组更便于处理。希望有帮助

<?php
function getCost($destination, $numTravelers, $numNights) {

    // organize them in an array format
    $prices["Barcelona"] = ['airfare' => 875, 'perNight' => 85, 'discount' => 0];
    $prices["Cairo"] = ['airfare' => 950, 'perNight' => 98, 'discount' => 0];
    $prices["Rome"] = ['airfare' => 875, 'perNight' => 110, 'discount' => 0];
    $prices["Tokyo"] = ['airfare' => 875, 'perNight' => 110, 'discount' => 200];    

    $min = 5; // minimum stay for discount

    // just get the value by providing the key (destination name)
    $tickets = $prices[$destination]['airfare'] * $numTravelers;
    $hotel = $numTravelers * $numNights * $prices[$destination]['perNight'];
    $total =  ($numNights = $min) ? $tickets + $hotel - $prices[$destination]['discount'] : $tickets + $hotel;
    // just for viewing the output
    echo 'Travel to ' . $destination . ' for ' . $numTravelers . ' people for ' . $numNights . ' nights cost: ' . $total . '<br>';
    return $total;
}

$cost1 = getCost('Tokyo', 3, 4);

$cost2 = getCost('Tokyo', 3, 5);
?>

输出

3人到东京旅游4晚费用：3945

---

3人到东京旅行5晚费用：4075

您的停留时间变量在哪里？需要更多关于代码的详细信息谢谢您的评论，但您的代码不起作用。谢谢，你能再解释一下吗？是的，我的代码中没有$subtotal。如何从中获得小计？我需要添加一个代码，使每位乘客在东京至少住5晚可以获得200折扣。您可以定义一个变量，该变量将在应用折扣之前或之后保留总计。我在下面添加了更多详细信息。感谢您的反馈！如果您需要帮助，请提供更多详细信息谢谢您的帮助，但这不起作用！我为这个问题加了更多的细节。谢谢，我不能使用你的代码，这不是我想要的。很抱歉我必须使用嵌套If或复合布尔表达式。谢谢你，迈克！你的第二个代码工作，如果我输入5晚，我得到200折扣，但有一个问题。如果我输入大于5，如6或7，我不会得到200折扣。为什么呢？如果数量大于5，则必须获得200美元的折扣。您想要一次性折扣200美元，还是想要每晚超过200美元？那么第5晚+第6晚+第7晚..总共600美元？还是200美元？我的意思是，如果我在东京住6晚，就没有200美元的折扣。@BoramLamppa:对不起，你不能这么做。这些问题，连同它们的答案，都是为未来的游客准备的，像你这样彻底地改变这些部分，就是一种破坏行为。如果你有一个新问题，那么一定要按照程序申请一个新职位，包括做你的研究等。

        if($destination == "Barcelona")
        {
            $airFare = 875;
            $perNight = 85;
        }

        else if($destination == "Cairo")
        {
            $airFare = 950;
            $perNight = 98;
        }

        else if($destination == "Rome")
        {
            $airFare = 875;
            $perNight = 110;
        }

        else if($destination == "Santiago")
        {
            $airFare = 820;
            $perNight = 85;
        }

        elseif($destination == "Tokyo")
        {
            $airFare = 1575;
            $perNight = 240;        
        }

        $discount = ($destination == "Tokyo" && $numNight == 5)? 200 : 0; // condition is here
        $tickets = $numTravelers * $airFare;
        $hotel = $numTravelers * $numNights * $perNight;
        $totalCost = $tickets + $hotel - $discount;
    ?>