PHP将小数转换成小数然后返回? [英] PHP convert decimal into fraction and back?

问题描述

我希望用户能够输入像这样的分数:

I want the user to be able to type in a fraction like:

 1/2
 2 1/4
 3

并将其转换为对应的十进制数，以保存在MySQL中，这样我就可以对其进行排序并对其进行其他比较.

And convert it into its corresponding decimal, to be saved in MySQL, that way I can order by it and do other comparisons to it.

但是向用户显示时，我需要能够将小数转换回小数

But I need to be able to convert the decimal back to a fraction when showing to the user

所以基本上我需要一个将分数字符串转换为十进制的函数:

so basically I need a function that will convert fraction string to decimal:

fraction_to_decimal("2 1/4");// return 2.25

和一个可以将小数转换为派系字符串的函数:

and a function that can convert a decimal to a faction string:

decimal_to_fraction(.5); // return "1/2"

我该怎么做?

推荐答案

我想我也要存储字符串表示形式，因为一旦运行数学运算，就不会将其取回来！

I think I'd store the string representation too, as, once you run the math, you're not getting it back!

而且，这是一个快速n脏的计算函数，不能保证:

And, here's a quick-n-dirty compute function, no guarantees:

$input = '1 1/2';
$fraction = array('whole' => 0);
preg_match('/^((?P<whole>\d+)(?=\s))?(\s*)?(?P<numerator>\d+)\/(?P<denominator>\d+)$/', $input, $fraction);
$result = $fraction['whole'] + $fraction['numerator']/$fraction['denominator'];
print_r($result);die;

为完整性起见，请添加检查以确保$fraction['denominator'] != 0.

Oh, for completeness, add a check to make sure $fraction['denominator'] != 0.

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