数值意外向下舍入

发布于 2024-12-24 03:31:00 字数 298 浏览 3 评论 0原文

我有一个循环计算几个收入值，然后将它们加在一起，如下所示：

$SalesGrowth = $C2012Sales+$C2011Sales;

在某些情况下，这有效，并且我得到了预期的结果，例如： 761.9 + 759.0 = 1520.9

在其他情况下，PHP 似乎随机决定错误地舍入(??) 并更改单位 (??)，我得到：

8,788.0 + 8,794.3 = 16

这是怎么回事？我什至尝试回显由空格分隔的单独销售值，并且它们显示正确，因此基本数字没有错误。

原文

I have a loop that calculates a couple revenue values then adds them together, like this:

$SalesGrowth = $C2012Sales+$C2011Sales;

In some cases, this works, and I get the expected, e.g.: 761.9 + 759.0 = 1520.9

In others, it looks like PHP randomly decides to round incorrectly (??) AND change the units (??) and I get:

8,788.0 + 8,794.3 = 16

What is going on here? I've even tried echoing out the separate sales values separated by a space, and they show up correctly, so the underlying figures aren't wrong.

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℡寂寞咖啡 2024-12-31 03:31:00

解释为数字时，8,788.0 就是 8，解析在逗号处停止。

如果您想允许像千位分隔符这样的花招，您将需要一些区域设置感知的数字解析。

更新：如果您有Zend Framework，您可以这样做：

require_once('Zend/Locale/Format.php');

$locale = new Zend_Locale('en_GB'); // #1

$v = "8,410.5";
$n = Zend_Locale_Format::getNumber($v, array('locale' => $locale,'precision' => 3));

echo 2 * $number;   // prints "16821"

您可以尝试从环境中获取它，而不是对区域设置进行硬编码：new Zend_Locale(setlocale(LC_ALL, ""))

Interpreted as a number, 8,788.0 is just 8, and parsing stops at the comma.

You'll need some locale-aware number parsing if you want to allow gimmicks like thousands-separators.

Update: If you have the Zend Framework, you can do this:

require_once('Zend/Locale/Format.php');

$locale = new Zend_Locale('en_GB'); // #1

$v = "8,410.5";
$n = Zend_Locale_Format::getNumber($v, array('locale' => $locale,'precision' => 3));

echo 2 * $number;   // prints "16821"

Instead of hard-coding the locale, you could try and take it from the environment: new Zend_Locale(setlocale(LC_ALL, ""))

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