用PHP进行精确的实数运算 [英] Doing exact real number arithmetic with PHP

问题描述

在PHP中对表示实数的字符串进行基本算术运算的最快，最简单的方法是什么?我有一个字符串，表示要在其上操作的MySQL的DECIMAL值，然后将结果返回到数据库.我想避免浮点实数表示法引入的错误.

What is fastest and most easy way of making basic arithmetic operations on strings representing real numbers in PHP? I have a string representing MySQL's DECIMAL value on which I want to operate and return the result to a database after that. I would like to avoid errors introduced by floating-point real number representation.

是否有一些标准库，例如Python的十进制?您是否可以推荐任何FOSS库?

Is there some standard library like Python's decimal? Are there any FOSS libraries you can recommend?

致谢

推荐答案

您可以使用BC数学函数:

You could use the BC math functions:

http://www.php.net/manual/en/ref. bc.php

还是GMP函数，尽管它们似乎只是整数.

Or the GMP functions, although they seem to be integer only.

http://www.php.net/manual/en/ref. gmp.php

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