问题描述
number_format stupidly 默认对数字进行四舍五入.有没有一种简单的方法可以关闭舍入?我正在处理随机生成的数字，我可以得到类似...
number_format stupidly rounds numbers by default. Is there just a simple way to turn off the rounding? I'm working with randomly generated numbers, and I could get things like...
42533 * .003 = 127.599 或，
42533 * .03 = 1275.99 或，
42533 * .3 = 12759.9
42533 * .003 = 127.599 or,
42533 * .03 = 1275.99 or,
42533 * .3 = 12759.9
我需要 number_format(或其他格式)以传统的美国格式(用逗号分隔千位)表示结果，并且不四舍五入.
I need number_format (or something else) to express the result in traditional U.S. format (with a comma separating the thousands) and not round the decimal.
有什么想法吗?
推荐答案
number_format 的第二个参数是数字中的小数位数.找出答案的最简单方法可能是将其视为字符串(根据 this question).传统的美国格式是默认行为，因此您无需指定其余参数.
The second argument of number_format is the number of decimals in the number. The easiest way to find that out is probably to treat it as a string (as per this question). Traditional US format is default behaviour, so you don't need to specify remaining arguments.
$num_decimals = strlen(substr(strrchr($number, "."), 1));
$formatted_number = number_format($number, $num_decimals);
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