如何使用html中的html形式选择和选项进行计算

Question

一种从用户那里获取大量信息并对其进行处理的表格，最后将显示一个数字。 根据其他对象获得许多对象。

index.php

 <form action="calc.php" method="POST">
     <select name="NumberOfPeople2">
      <option value="1">1</option>
      <option value="2">2</option>
     </select>
     <select name="NumberOfBathTimes">
        <option value="1">one</option>
        <option value="2">two</option>
      </select>
     <select name="DurationOfBathing">
        <option value="10">10 min</option>
        <option value="20">20 min</option>
      </select>
     <input type="submit" value="submit">
  </form>

calc.php

<?php
 include 'include/calc.inc.php';

$NumberOfPeople = $_POST['NumberOfPeople'];

$NumberOfBathTimes = $_POST['NumberOfBathTimes'];

if($_POST['DurationOfBathing']=='10')
{
    $DurationOfBathing='60';
}
if($_POST['DurationOfBathing']=='20')
{
    $DurationOfBathing='100';
}
if($_POST['NumberOfBathTimes']=='1')
{
    $FactorUseBath='0.14285714';
    $FactorNumberBath='1.2';
}
if($_POST['NumberOfBathTimes']=='2')
{
    $FactorUseBath='0.28571429';
    $FactorNumberBath='1.2';
}



$ConsumptionBath = new Calc($NumberOfPeople,$DurationOfBathing,$FactorUseBath,$FactorNumberBath);
echo $ConsumptionBath->calcMethod();

calc.inc.php

<?php
class Calc{

public $NumberOfPeople;
public $DurationOfBathing;
public $FactorUseBath;
public $FactorNumberBath;

public function __construct($NumberOfPeople,$DurationOfBathing,$FactorUseBath,$FactorNumberBath){

        $this->NumberOfPeople = $NumberOfPeople;
        $this->DurationOfBathing; = $DurationOfBathing;
        $this->FactorUseBath; = $FactorUseBath;
        $this->FactorNumberBath; = $FactorNumberBath;
}
public function calcMethod(){
    $result = $this->DurationOfBathing*$this->FactorUseBath;*$this->FactorNumberBath*$this->NumberOfPeople;
    return $result;
}
 }

获得的所有对象必须相乘。 答案是$ ConsumptionBath这是正确的方法吗？

Answer 1

这是正确的方法，但是您应该在脚本中使用的每个位置声明每个变量。 例如，在给定的脚本，变量$DurationOfBathing仅在初始化if条件并给undefined variable错误的情况下， if条件失败。 所以我更新了下面的代码：

include 'include/calc.inc.php';

$NumberOfPeople = $_POST['NumberOfPeople'];

$NumberOfBathTimes = $_POST['NumberOfBathTimes'];

$DurationOfBathing = $FactorUseBath = $FactorNumberBath = '';
if ($_POST['DurationOfBathing'] == '10') {
    $DurationOfBathing = '60';
} else if ($_POST['DurationOfBathing'] == '20') {
    $DurationOfBathing = '100';
}
if ($_POST['NumberOfBathTimes'] == '1') {
    $FactorUseBath = '0.14285714';
    $FactorNumberBath = '1.2';
} else if ($_POST['NumberOfBathTimes'] == '2') {
    $FactorUseBath = '0.28571429';
    $FactorNumberBath = '1.2';
}
$ConsumptionBath = new Calc($NumberOfPeople, $DurationOfBathing, $FactorUseBath, $FactorNumberBath);
echo $ConsumptionBath->calcMethod();

更新资料

课堂上也有一些问题。 一些额外的半冒号; 被添加到那里。 使用此更新的代码：

<?php

class Calc {

    public $NumberOfPeople;
    public $DurationOfBathing;
    public $FactorUseBath;
    public $FactorNumberBath;

    public function __construct($NumberOfPeople, $DurationOfBathing, $FactorUseBath, $FactorNumberBath) {

        $this->NumberOfPeople = $NumberOfPeople;
        $this->DurationOfBathing = $DurationOfBathing;
        $this->FactorUseBath = $FactorUseBath;
        $this->FactorNumberBath = $FactorNumberBath;
    }

    public function calcMethod() {
        $result = $this->DurationOfBathing * $this->FactorUseBath * $this->FactorNumberBath * $this->NumberOfPeople;
        return $result;
    }

}