bcmath操作数量很少 [英] bcmath operations with very small numbers

问题描述

我想使用bcmath进行非常小的数字的精确运算，但是失败了.我正在尝试计算加密货币价格，并认为bcmath优于将float转换为整数

I want to use bcmath for precise operations with very small numbers, but it fails. I am trying to calculate cryptocurrency prices and thought that bcmath is better than converting float to integers

此工作方式:

php> echo number_format(0.000005 * 0.0025，10);

php > echo number_format(0.000005 * 0.0025, 10);

0.0000000125

0.0000000125

这不起作用:

php> echo number_format(bcmul(0.000005，0.0025，10)，10);

php > echo number_format(bcmul(0.000005, 0.0025, 10), 10);

0.0000000000

0.0000000000

php> echo number_format(bcadd(0.000005，0.00000025，10)，10);

php > echo number_format(bcadd(0.000005, 0.00000025, 10), 10);

0.0000000000

0.0000000000

bcmath是否有某些配置，或者这是正常现象?

推荐答案

您需要将bc *函数参数作为字符串传递.否则，它们将被解释为本地浮点数，并受其限制.

You need to pass the bc* function arguments as strings. Otherwise, they're interpreted as native floats and subject to the limits thereof.

echo bcmul('0.000005', '0.0025', 10), "\n";
echo number_format(bcmul('0.000005', '0.0025', 10), 10), "\n";

输出:

0.0000000125
0.0000000125

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