(PHP 4, PHP 5, PHP 7, PHP 8)
bcsub — 两个任意精度数字的减法
$num1
, string $num2
, int|null $scale = null
) : string
num1 减去 num2。
num1字符串类型的左操作数。
num2字符串类型的右操作数。
scale此可选参数用于设置结果中小数点后的小数位数。也可通过使用
bcscale() 来设置全局默认的小数位数，用于所有函数。如果未设置，则默认为 0。
以 string 类型返回减法之后的结果。
| 版本 | 说明 |
|---|---|
| 8.0.0 |
现在 scale 可以为 null。
|
Example #1 bcsub() 示例
<?php
$a = '1.234';
$b = '5';
echo bcsub($a, $b); // -3
echo bcsub($a, $b, 4); // -3.7660
?>
Please note that bcsub will fail in non-obvious ways if it's fed something that cannot be converted to a number. For instance:
bcsub('yes', 'no') === '0'
Yes, if you put garbage in, you get garbage out. Just don't expect bcsub to throw an error when you feed it an entirely non-numeric value.
The parameter order here is probably fairly obvious to most people (subtract right from left), but to clarify with a simple use case since I was struggling with this at the end of a long day:
<?php
echo bcsub('7', '5'); // 7 - 5 = '2'
echo bcsub('12', '17'); // 12 - 17 = '-5'
?>
Provide the parameters in the same order you would when using a normal subtraction operator.