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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.

## 例

例子 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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bcsqrt | 上一级 | PHP bytecode Compiler