固定为 0.2 小数

发布于 2024-12-18 00:13:30 字数 412 浏览 0 评论 0原文

可能的重复：
PHP 中默认输出的小数位数 < /p>

基本上有点数学问题，

$average_ppm = $total_points_given / $totalvalue;

$average_ppm 现在等于 2.432608695652174，我不想显示这些数字，我只需要 $average_ppm 2.43，因此固定到小数点后 2 位。我该怎么做？

谢谢大家的时间。

原文

Possible Duplicate:
Default Number of Decimal Places to Output in PHP

basically a bit of a maths problem,

$average_ppm = $total_points_given / $totalvalue;

$average_ppm now equals 2.432608695652174, I don't want to display these numbers, I just need $average_ppm to be 2.43, so to a fixed 2 decimal points. How can I do this??

Thanks for anyones time.

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池予 2024-12-25 00:13:30

如果您想要字符串输出，请使用 sprintf ，或者 圆形/地板/ceil 对于数值：

$average_ppm = 2.432608695652174;

echo sprintf("%.2f", $average_ppm); // 2.43

$approx_average_ppm = round($average_ppm, 2);
echo $approx_average_ppm; // 2.43

echo floor($average_ppm, 2); // 2.43 , even if $average_ppm = 2.439
echo ceil($average_ppm, 2); // 2.44

Use sprintf if you want a string output, or round/floor/ceil for a numeric value:

$average_ppm = 2.432608695652174;

echo sprintf("%.2f", $average_ppm); // 2.43

$approx_average_ppm = round($average_ppm, 2);
echo $approx_average_ppm; // 2.43

echo floor($average_ppm, 2); // 2.43 , even if $average_ppm = 2.439
echo ceil($average_ppm, 2); // 2.44

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魂牵梦绕锁你心扉 2024-12-25 00:13:30

您可以使用 sprintf、圆形或地板/ceil 取决于你如何想要数字四舍五入。

最适合您需要的是圆形：

$average_ppm = round($total_points_given / $totalvalue,2);

You could either use sprintf, round or floor/ceil depending on how you want the numbers rounded.

Most suited for your need would be round:

$average_ppm = round($total_points_given / $totalvalue,2);

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旧话新听 2024-12-25 00:13:30

如果你想在...之后始终有 2 个数字，你可以使用 number_format< /a>:

number_format(2.43260869565217, 2); // 2.43

当你得到一个像这样的数字：2.400054846 并且你使用 round 你会得到 2.4
如果你想要后面有 2 个数字，你可以使用 number_format 这将输出 2.40

If you want to have ALWAYS 2 numbers after... you can do it with number_format:

number_format(2.43260869565217, 2); // 2.43

When you got a number like: 2.400054846 and you use round you will get 2.4
and if you want it with 2 number behind you can use number_format this will output 2.40

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