PHPのお勉強！

PHP TOP
PHP 8.4.2 Released!

    bccomp

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

    bccomp — 2 つの任意精度数値を比較する

    説明

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

    num1 と num2 を比較し、 比較結果を整数値で返します。

    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 the bcmath.scale INI directive.

    戻り値

    ふたつのオペランドが等しければ 0、 num1 が num2 より大きければ戻り値は 1、小さければ -1 を返します。

    エラー / 例外

    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.

    変更履歴

    バージョン 説明
    8.0.0 scale は、nullable になりました。

    例

    例1 bccomp() の例

    <?php

    echo bccomp('1', '2') . "\n"; // -1
    echo bccomp('1.00001', '1', 3); // 0
    echo bccomp('1.00001', '1', 5); // 1

    ?>

    Found A Problem?

    Learn How To Improve This Page • Submit a Pull Request • Report a Bug
    ＋add a note

    User Contributed Notes 4 notes

    up
    25
    Robert Lozyniak
    14 years ago
    Beware that negative zero does not compare equal to positive zero.
    up
    15
    aaugrin at gmail dot com
    6 years ago
    BEWARE! left and right operand is string!! so number in E-notation like 9.012E-6 need to be converted with sprintf('%F') to string
    up
    0
    mm at mobelt dot com
    14 days ago
    If you want to compare 2 decimals for equality, bccomp does not works as expected:

    bccomp("1.000000000000000","0.999999999999999",2)

    returns 1

    Instead, use

    bcsub("1.000000000000000","0.999999999999999",2) == 0
    up
    -3
    m dot kaczanowski at alianet dot pl
    15 years ago
    Improvement of functions bcmax() and bcmin() originaly written by frank at booksku dot com

    <?php

    function bcmax() {
    $args = func_get_args();
    if (    count($args)==0) return false;
    $max = $args[0];
    foreach(    $args as $value) {
    if (    bccomp($value, $max)==1) {
    $max = $value;
    }
    }
    return     $max;
    }

    function     bcmin() {
    $args = func_get_args();
    if (    count($args)==0) return false;
    $min = $args[0];
    foreach(    $args as $value) {
    if (    bccomp($min, $value)==1) {
    $min = $value;
    }
    }
    return     $min;
    }
    ?>
    ＋add a note
    To Top