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demo01.php
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>demo01</title>
<style>
.wai{
width: 900px;
height: 30%;
background-color: rgb(151, 151, 151);
}
.a{
margin: 0px;
width: 300px;
text-align:center;
border: 1px solid #000;
}
</style>
</head>
<body>
<div style="width: 900px;text-align:center;font-size:30px;">商品价格计算</div>
<div class="wai">
<form action="demo01.php" method="post">
<table>
<tr>
<td class="a">商品名称</td>
<td class="a">购买数量</td>
<td class="a">商品价格</td>
</tr>
<tr>
<td class="a">橘子</td>
<td>
<input style="background-color: rgb(151, 151, 151);width: 300px;" type="text" name="juzi">
</td>
<td class="a">7.99</td>
</tr>
<tr>
<td class="a">香蕉</td>
<td>
<input style="background-color: rgb(151, 151, 151);width: 300px;" type="text" name="xiangjiao">
</td>
<td class="a">6.89</td>
</tr>
<tr>
<td class="a">苹果</td>
<td>
<input style="background-color: rgb(151, 151, 151);width: 300px;" type="text" name="pinguo">
</td>
<td class="a">3.99</td>
</tr>
<tr>
<td class=""></td>
<td></td>
<td class="a"style=" border:0px solid #000;">商品折扣：0.8</td>
</tr>
<tr>
<td class=""></td>
<td><input type="submit" value="提交" name="submit"></td>
<td class="a"style=" border:0px solid #000;">
<?php
{
function sum($juzi, $xiangjiao, $pinguo) { //定义一个函数，接收$juzi,$xiangjiao,$pinguo三个变量的数值
$sum = $juzi*7.99 + $xiangjiao*6.89 + $pinguo*3.99; //在函数内部将这三个变量赋值给$sum并且*每样物品的单价
return $sum; //通过return结果
}
$juzi = $_POST['juzi'];
$xiangjiao = $_POST['xiangjiao']; //表单中获取名为xiangjiao的input元素的值，并将其赋值给变量$xiangjiao。
$pinguo = $_POST['pinguo'];
$zongjiage = sum($juzi, $xiangjiao, $pinguo);//调用sum函数，将表单中返回的值相加赋值给变量$zongjiage
$a = 0.8; //定义打折数值的变量
$zhekou = $zongjiage*$a; //用赋值完的总价格乘以打折的数值，赋值给最终折扣数值
echo "打折后商品的总价格： $zhekou"; //通过echo输出总价格
}
?></td>
</tr>
</table>
</form>
</div>
<br>
</body>
</html>