bcsub

(PHP 4, PHP 5, PHP 7, PHP 8)

bcsub — Subtract one arbitrary precision number from another

function bcsub(string $num1, string $num2, ?int $scale = null): string

Subtracts num2 from num1.

num1: The left operand, as a string.
num2: The right operand, as a string.
scale: This parameter is used to set the number of digits after the decimal place in the result. If null, it will default to the default scale set with bcscale(), or fallback to the value of the bcmath.scale INI directive.

The result of the subtraction, as a string.

This function throws a ValueError in the following cases:

Version	Description
8.0.0	`scale` is now nullable.

Example #1 bcsub() example

<?php

$a = '1.234';
$b = '5';

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

?>