bcsub

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

bcsub — Subtract one arbitrary precision number from another

Опис

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

Subtracts num2 from num1.

Параметри

num1: The left operand, as a string.
num2: The right operand, as a string.
scale: Необов'язковий параметр, яким вказується кількість знаків після крапки в результаті. Якщо опущено, застосовується межа, що встановлена глобально функцією bcscale(), або ж 0, якщо межа ще не встановлена.

Значення, що повертаються

The result of the subtraction, as a string.

Помилки/виключення

This function throws a ValueError in the following cases:

num1 or num2 is not a well-formed BCMath numeric string.
scale is outside the valid range.

Журнал змін

Версія	Опис
8.0.0	`scale` is now nullable.

Приклади

Приклад #1 bcsub() example

<?php

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

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

?>

Прогляньте також

bcadd() - Add two arbitrary precision numbers

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User Contributed Notes 2 notes

down

nd at snackbox dot org ¶

6 years ago

The parameter order here is probably fairly obvious to most people (subtract right from left), but to clarify with a simple use case since I was struggling with this at the end of a long day:

<?php
echo bcsub('7', '5'); // 7 - 5 = '2'
echo bcsub('12', '17'); // 12 - 17 = '-5'
?>

Provide the parameters in the same order you would when using a normal subtraction operator.

down

charles dot adrian dot wood at gmail dot com ¶

5 years ago

Please note that bcsub will fail in non-obvious ways if it's fed something that cannot be converted to a number. For instance:

bcsub('yes', 'no') === '0'

Yes, if you put garbage in, you get garbage out. Just don't expect bcsub to throw an error when you feed it an entirely non-numeric value.

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