PHP中带小数的简单数学 [英] Simple math with decimals in PHP

问题描述

这真杀了我！我从来没有遇到这么多麻烦，也无法弄清楚我在做什么错.

This is killing me! I've never had so much trouble and I can't figure out what I'm doing wrong here.

如果我有一个数字，说2.32，而我想用它做数学运算，那将是行不通的.最简单的例子:

If I have a number, say 2.32, and I want to do math with it it won't work out. The very simplest example:

$income = $commission; //Commission is 2.32, retrieved from XML
echo "income: $income<br>";
$income100 = $income*100;
echo "income100: $income100<br>";

我得到的结果是:

income: 2.32
income100: 200

如何在不改变小数的情况下准确地使用数学?

How can I use a decimal number accurately with math without it changing it?

非常感谢！

推荐答案

您需要以以下方式分配$income来摆脱基础的SimpleXMLElement:

You need to assign $income in the following manner to get rid of the underlying SimpleXMLElement:

$income = (float) $commission;

当您不这样做时会发生什么的示例:

$x = simplexml_load_string("<a>2.4</a>");
echo $x * 100; // output:  200

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