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# bcsub

(PHP 3, PHP 4, PHP 5)

bcsub -- Subtract one arbitrary precision number from another

## Description

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

Subtracts the right_operand from the left_operand and returns the result in a string. The optional scale parameter is used to set the number of digits after the decimal place in the result.

## �d��

範例 1. bcsub() example

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

## �Ѧ�

bcadd().

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