[英]PHP: calculate total price according to which options a user chooses from HTML form
[英]How can i calculate the total price from the user input from select from using php
我想計算來自 $_SESSION 的用戶輸入的總價格。 但是,我的代碼似乎有問題。
<label>Seats STA:</label>
<select name="seats[STA]" id="STA">
<option value="0">0</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
<option value="8">8</option>
<option value="9">9</option>
<option value="10">10</option>
</select>
<span class="error">* Please select atleast 1 seat <?php echo $seatErr ;?></span>
$_SESSION['seats']['STA']=$_POST['seats']['STA'];
$sta = 15;
$stp = 5;
$stc = 7.5;
$fca = 30;
$fcp = 20;
$fcc = 15;
$totalamount = "0.0";
$totalamount = $_SESSION['seats']['STA'] * $sta +
$_SESSION['seats']['STP'] * $stp +
$_SESSION['seats']['STC'] * $stc +
$_SESSION['seats']['FCA'] * $fca +
$_SESSION['seats']['FCP'] * $fcp +
$_SESSION['seats']['FCC'] * $fcc;
$tax = 0.1;
$totalprice = $totalamount * (1+$tax);
number_format($totalprice,2);
我的問題是,
$sta
是節省價格的正確方法嗎?
如果沒有,我在哪里可以保存 select 表格中的產品價格?
是number_format($totalprice,2);
顯示2位小數的正確方法?
感謝您閱讀我的代碼!!
您可以將價格保存在數組中。 例如,您還可以從 JSON 文件或數據庫中讀取此信息。
價格永遠不應該由用戶發送。
如果你想顯示價格是的,但如果你想繼續計算價值, round($total_price, 2)
是更合適的方法。
代碼:
$_PRICES = array(
"STA" => 15,
"STP" => 5,
"STC" => 7.5,
"FCA" => 30,
"FCP" => 20,
"FCC" => 15
);
$total_price = 0;
foreach ($_SESSION['seats'] as $item => $amount) {
$price = $_PRICES[$item];
if ($price != null) {
$total_price += $amount * $price;
}
}
$tax = 0.1;
$total_price *= 1+$tax;
echo number_format($total_price,2);
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