将 php 十进制值舍入到最后 0 之后的第二个数字 [英] round php decimal value to second digit after last 0

问题描述

我有一个以十进制值结尾的即时"计算结果(使用money_format转换后)如下:

I have results of an "on the fly" calculation that end in decimal values (after converted using money_format) as follows:

$cost_per_trans  = 0.0000000476 

$cost_per_trans = 0.0000007047

money_format 前对应的值为:

The corresponding values before the money_format are:

4.7564687975647E-8

7.0466204408366E-7

这些值的长度可能不同，但我希望能够将它们四舍五入到0"字符串后的最后 2 位数字，例如:

These values may be of different lengths but I would like to be able to round them to the last 2 digits after the string of "0s", to get this for example:

$cost_per_trans = 0.000000048 

$cost_per_trans = 0.00000070

我不确定

1. 如何在正确的位置进行回合?

1. how to do the round in the right spot?

是在money_format之前还是之后舍入?

whether to round before or after the money_format?

推荐答案

function format_to_last_2_digits($number) {
    $depth = 0;
    $test = $number;
    while ($test < 10) {    // >10 means we have enough depth
        $test = $test * 10;
        $depth += 1;
    }
    return number_format($number, $depth);
}

$cost_per_trans = 0.0000000476;
var_dump(format_to_last_2_digits($cost_per_trans)); // 0.000000048
$high_number = 300;
var_dump(format_to_last_2_digits($high_number));    // 300

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