PHP警告:除数为零 [英] PHP Warning: Division by zero

问题描述

我正在学习php，并建立了一个实验性的基于表单的计算器(也使用html& POST方法)，该计算器将值返回到表中.输入值并单击提交"时，计算器将起作用，但是在我第一次运行代码时，在最后一行仍然出现两个被零除"错误.在此处或通过Google搜索时，似乎似乎找不到合乎逻辑的解决方案或解释.您可以提供给newb的任何解释将不胜感激.

I'm learning php and built an experimental form-based calculator (also using html & POST method) that returns values to a table. The calculator is functional when I enter my values and click submit, but I keep getting two "Division by zero" errors on the last line when I first run the code. I can't seem seem to find a logical solution or explanations when searching here or via Google. Any explanation you can provide to a newb will be appreciated.

<?php 

error_reporting(E_ALL ^ E_NOTICE);

//calculate the difference in price

$itemQty = $_POST['num1'];

$itemCost = $_POST['num2'];

$itemSale = $_POST['num3'];

$shipMat = $_POST['num4'];

$diffPrice = $itemSale - $itemCost;

$actual = ($diffPrice - $shipMat) * $itemQty;

$diffPricePercent = (($actual * 100) / $itemCost) / $itemQty ;

?>

推荐答案

您需要将表单处理代码包装在条件代码中，这样在您第一次打开页面时它就不会运行.像这样:

You need to wrap your form processing code in a conditional so it doesn't run when you first open the page. Something like so:

if($_POST['num1'] > 0 && $_POST['num2'] > 0 && $_POST['num3'] > 0 && $_POST['num4'] > 0){

  $itemQty = $_POST['num1'];
  $itemCost = $_POST['num2'];
  $itemSale = $_POST['num3'];
  $shipMat = $_POST['num4'];

  $diffPrice = $itemSale - $itemCost;
  $actual = ($diffPrice - $shipMat) * $itemQty;
  $diffPricePercent = (($actual * 100) / $itemCost) / $itemQty ;
}

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