bcsub
(PHP 4, PHP 5, PHP 7, PHP 8)
bcsub — 任意精度数値の減算を行う
説明
left_operand
から
right_operand
を引きます。
パラメータ
num1
-
左オペランドを表す文字列。
num2
-
右オペランドを表す文字列。
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 thebcmath.scale
INI directive.
戻り値
減算の結果を文字列で返します。
エラー / 例外
This function throws a ValueError in the following cases:
-
num1
ornum2
is not a well-formed BCMath numeric string. -
scale
is outside the valid range.
変更履歴
バージョン | 説明 |
---|---|
8.0.0 |
scale is now nullable.
|
例
例1 bcsub() の例
<?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
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.
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.
↑ and ↓ to navigate •
Enter to select •
Esc to close
Press Enter without
selection to search using Google