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bcsub — 2个任意精度数字的减法
$left_operand
, string $right_operand
[, int $scale
= int
] ) 左操作数
减去右操作数
.
left_operand
字符串类型的左操作数.
right_operand
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。
返回减法之后结果为字符串类型.
Example #1 bcsub() example
<?php
$a = '1.234' ;
$b = '5' ;
echo bcsub ( $a , $b ); // -3
echo bcsub ( $a , $b , 4 ); // -3.7660
?>
[#1] 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.