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# bcsub

(PHP 3, PHP 4, PHP 5)

bcsub -- Subtract one arbitrary precision number from another

## 说明

string bcsub ( string left_operand, string right_operand [, int scale] )

Subtracts the `right_operand` from the `left_operand`.

## 参数

`left_operand`

  The left operand, as a string.

`right_operand`

  The right operand, as a string.

`scale`

  This optional parameter is used to set the number of digits after the decimal place in the result. You can also set the global default scale for all functions by using bcscale().

## 返回值

The result of the substraction, as a string.

## 范例

例 1. bcsub() example

`<?php $a = '1.234'; $b = '5'; echo bcsub($a, $b); // -3 echo bcsub($a, $b, 4); // -3.7660 ?>`

## 参见

bcadd()

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