Question

我是PHP的新生。当有人购买100美元以上时，我想给予20％的折扣。

这是我当前的代码，显示唯一的商品价格和总价格，包括增值税。

HTML：

<form action="sweet1.php" method="post">
Item Name: <input type="text" value="" style="display: none;">
    <select name="sweet">
        <option value="Item one@250">Item One USD 250</option>
        <option value="Item Two@180">Item Two USD 180</option>
    </select>

<br><br>

Quantity: <input type="text" name="qty" value="">

<br><br>

<input type="submit" value="Purchase">
</form>

PHP：

<?php
$sweet_name=$_POST['sweet'];
$qty=$_POST['qty'];

$position=strpos($sweet_name, '@');
echo $position;
$sweet=substr($sweet_name,0,$position);
$price=substr($sweet_name,$position+1);

echo 'Sweet Details';
echo '<br>Item Name: '.$sweet;
echo '<br>Qty: '.$qty;
echo '<br>Unique Item Price: '.$price;
echo '<br>Total Iteam Price: '.$price*$qty;
$tprice=$price*$qty;
$vat= $tprice*.10;
$tamount=$tprice+$vat;
echo '<br> Total Amount (VAT Included): '.$tamount;
?>

Answer 1

您可以尝试使用以下代码来避免DOM更改。

<form action="sweet1.php" method="post">
    Item Name: <input type="text" value="" style="display: none;">
    <select name="sweet">
        <option value="item_1">Item One USD 250</option>
        <option value="item_2">Item Two USD 180</option>
    </select>

    <br><br>
    Quantity: <input type="text" name="qty" value="">

    <br><br>

    <input type="submit" value="Purchase">
</form>

PHP脚本：

<?php
$sweet_arr = array(
    "item_1" => array(
        "name" => "Item one@250",
        "price" => "250"
    ),
    "item_2" => array(
        "name" => "Item Two@180",
        "price" => "180"
    )
);
$sweet_name = $_POST['sweet'];
$qty = $_POST['qty'];

try {

    if (!is_array($sweet_arr[$sweet_name])) {
        throw new Exception("Item not found.");
    }

    $sweet = $sweet_arr[$sweet_name]['name'];
    $price = $sweet_arr[$sweet_name]['price'];

    if (empty($price)) {
        throw new Exception("Price not defined.");
    }

    echo 'Sweet Details';
    echo '<br>Item Name: ' . $sweet;
    echo '<br>Qty: ' . $qty;
    echo '<br>Unique Item Price: ' . $price;
    echo '<br>Total Iteam Price: ' . $price * $qty;

    $tprice = $price * $qty;
    $vat = $tprice * .10;
    if ($tprice > 500) {
        $discount = $tprice * .20;
        $tprice -= $discount;
    }
    $tamount = $tprice + $vat;

    echo '<br> Total Amount (VAT Included): ' . $tamount;
} catch (Exception $e) {
    echo $e->getMessage();
}

Answer 2

试试这个：

$sweet_name=$_POST['sweet'];
$qty=$_POST['qty'];

$position=strpos($sweet_name, '@');
echo $position;
$sweet=substr($sweet_name,0,$position);
$price=substr($sweet_name,$position+1);

echo 'Sweet Details';
echo '<br>Item Name: '.$sweet;
echo '<br>Qty: '.$qty;
echo '<br>Unique Item Price: '.$price;
echo '<br>Total Iteam Price: '.$price*$qty;
$tprice=$price*$qty;
$vat= $tprice*.10;
$tamount=$tprice+$vat;
$discount = 0;
if ($tprice > 500) {
  $discount = $tprice * 20/100;
}
$tamount -= $discount;
echo '<br> Total Amount (VAT Included): '.$tamount;

Answer 3

如果您希望在总金额为500美元的情况下购买20％，则添加以下代码

    if ($tamount > 500)
    {
    $discount = $tamount*20/100;
    $tamount = $tamount - $discount;
    }

当有人购买500美元以上时，我想给予20％的折扣

3 个答案: