bcsub

(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

Example#1 bcsub() example


<?php

$a = '1.234';
$b = '5';

echo bcsub($a, $b);     // -3
echo bcsub($a, $b, 4);  // -3.7660

?>

参见

bcadd()