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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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