我一直在用 PHP 处理长数字。就像下面的例子。
12.020000
12.000000
为了摆脱尾随零和小数点，我一直在函数中使用以下内容。
return rtrim(rtrim($str, "0"),".");
所以上面的结果是这样的。
12.02
12
这有点短视，因为当1000进入时它会变成1.
有人可以帮我编写代码以仅删除小数点后的尾随零吗？
如果代码删除了小数位，则加分，但我总是可以将其输入rtim($str,".").
编辑：为了清楚起见，我只在显示到屏幕时删除小数位和零。也不能选择浮动，因为我也处理像 0.00000001 这样的数字，这些数字就像 1.0e-9 一样。
你为什么用字符串来保存数字？让它浮动，它会解决你的问题。
$string = '12.020000';
$number = (float) $string; // will be 12.02
然后，如果您想将其用作字符串（但为什么呢？）
$string = (string) $number;
The thing that perplexes me about your question is that extra zeros won't be included in a number variable without intentionally adding them with number_format. (This may be why someone down-voted it).
Normally you don't want to use string functions (meant for text) on variables that hold numbers. If you want to round off a number, use a function like round.
http://php.net/manual/en/function.round.php
There's also number_format, which can format numbers by adding zero padding: (it doesn't actuall round, just trims off excess numbers).
http://php.net/manual/en/function.number-format.php
Since your zeros are appearing, it's likely that you simply need to multiple the variable by 1, which will essentially convert a string to a number.
Good luck!