(PHP 4, PHP 5)
bcsub — Subtract one arbitrary precision number from another
$left_operand
, string $right_operand
[, int $scale
] )
Subtracts the right_operand from the
left_operand.
left_operand
The left operand, as a string.
right_operand
The right operand, as a string.
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。
The result of the subtraction, as a string.
Example #1 bcsub() example
<?php
$a = '1.234';
$b = '5';
echo bcsub($a, $b); // -3
echo bcsub($a, $b, 4); // -3.7660
?>
info at DONOTSPAM dot ict-eagle dot eu (2009-08-07 12:43:35)
Note that it is almost useless to put a integer higher than 6 maybe 7 in the scale parameter.
In some cases this might be needed. But for the simple souls, more than 4 is not required in most of the time.