我有一个显示带有单选按钮的项目的站点。我想让 PHP 代码在用户提交代码时显示总计。以下是我目前拥有的代码以及商店中每件商品的价格。<?php $keybored = $_POST["keybored"];$mouse = $_POST["mouse"];$harddrive = $_POST["harddrive"];$desktop = $_POST["desktop"];$keyboredprice = 5.00;$mouseprice = 3.50;$hardriveprice = 20.00;$desktopprice = 100;$total = $prices;echo "$total"; ?>我正在使用的 HTML 代码发布在下面，用于网上商店。<!DOCTYPE html><html> <head> <style> body {background-color: lightblue;} h1 {color: gray;} h2 {color: white; border-size: 1; width: 200px; border: 15px solid black; padding: 50px; margin: 10px;} p {color: white; font-size: 200%;} img {width:350px;height:300px;} </style> </head><body> <form action="purchase.php" method="post"><h1> Welcome to computer parts store</h1><h2>Keybored</h1><img src="keybored.jpg"><p> Select how many <br><input type="radio" name="keybored" value="1"">1<br><input type="radio" name="keybored" value="2">2<br><input type="radio" name="keybored" value="3"> 3<br> <br></p><h2>Mouse</h1><img src="mouse.jpg"><p> Select how many <br><input type="radio" name="mouse" value="1"">1<br><input type="radio" name="mouse" value="2">2<br><input type="radio" name="mouse" value="3"> 3<br> <br></p><h2>HarDrive</h1><img src="harddrive.jpeg" ><p> Select how many <br><input type="radio" name="harddrive" value="1">1<br><input type="radio" name="harddrive" value="2">2<br><input type="radio" name="harddrive" value="3"> 3<br> <br></p><h2>Desktop</h1><img src="Desktop.jpg"><p> Select how many <br><input type="radio" name="desktop" value="1">1<br><input type="radio" name="desktop" value="2">2<br><input type="radio" name="desktop" value="3"> 3<br> <br></p>
2 回答
慕容3067478
TA贡献1773条经验 获得超3个赞
简单：数量*价格。
<?php
$keybored = $_POST["keybored"] ?? 0;
$mouse = $_POST["mouse"] ?? 0;
$harddrive = $_POST["harddrive"] ?? 0;
$desktop = $_POST["desktop"] ?? 0;
$keyboredprice = 5.00;
$mouseprice = 3.50;
$hardriveprice = 20.00;
$desktopprice = 100;
$total = ($keybored * $keyboredprice) + ($mouse * $mouseprice) + ($hardrive * $hardriveprice) + ($desktop * $desktopprice);
echo "$total";
PHP 是松散类型的，会为您将表格数量字符串转换为整数，并且还会在乘法中保留浮点数价格。
如果未提交任何表单元素，这将使用 php7 空合并运算符 (??) 将默认数量设置为 0。
杨魅力
TA贡献1811条经验 获得超6个赞
在尝试向用户显示其价值之前，您需要计算价格。$price = $keyboredprice + $mouseprice + $hardriveprice + $desktopprice;
$total = $price
echo "$total"
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