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.
bcsub
(PHP 4, PHP 5, PHP 7)
bcsub — Subtract one arbitrary precision number from another
Descrierea
bcsub
( string
$num1
, string $num2
[, int|null $scale = null
] ) : string
Subtracts the num2 from the
num1.
Parametri
-
num1 -
The left operand, as a string.
-
num2 -
The right operand, as a string.
-
scale -
Acest parametru opțional este utilizat pentru a stabili numărul cifrelor după virgulă din rezultat. Dacă este omis, valoarea implicită va fi cea stabilită global cu funcția bcscale(), sau va fi
0dacă nu a fost stabilită cu ajutorul acestei funcții.
Valorile întoarse
The result of the subtraction, as a string.
Istoricul schimbărilor
| Versiune | Descriere |
|---|---|
| 8.0.0 |
scale is now nullable.
|
Exemple
Example #1 bcsub() example
<?php
$a = '1.234';
$b = '5';
echo bcsub($a, $b); // -3
echo bcsub($a, $b, 4); // -3.7660
?>
add a note
User Contributed Notes 2 notes
nd at snackbox dot org ¶
6 years ago
charles dot adrian dot wood at gmail dot com ¶
4 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.
