bcscale

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

    bcscale — Set or get default scale parameter for all bc math functions

    Description

    bcscale(int $scale): int

    Sets the default scale parameter for all subsequent calls to bc math functions that do not explicitly specify a scale parameter.

    bcscale(null $scale = null): int

    Gets the current scale factor.

    Parameters

    scale

    The scale factor.

    Return Values

    Returns the old scale when used as setter. Otherwise the current scale is returned.

    Changelog

    Version Description
    8.0.0 scale is now nullable.
    7.3.0 bcscale() can now be used to get the current scale factor; when used as setter, it now returns the old scale value. Formerly, scale was mandatory, and bcscale() always returned true.

    Examples

    Example #1 bcscale() example

    <?php

    // default scale : 3
    bcscale(3);
    echo     bcdiv('105', '6.55957'); // 16.007

    // this is the same without bcscale()
    echo bcdiv('105', '6.55957', 3); // 16.007

    ?>

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    User Contributed Notes 4 notes

    up
    23
    mwgamera at gmail dot com
    16 years ago
    These functions DO NOT round off your values. No arbitrary precision libraries do it this way. It stops calculating after reaching scale of decimal places, which mean that your value is cut off after scale number of digits, not rounded. To do the rounding use something like this:
    <?php
    function bcround($number, $scale=0) {
    $fix = "5";
    for (    $i=0;$i<$scale;$i++) $fix="0$fix";
    $number = bcadd($number, "0.$fix", $scale+1);
    return     bcdiv($number, "1.0", $scale);
    }
    ?>
    up
    16
    sicerwork at aliyun dot com
    7 years ago
    Executing bcsacle() will change the scale value of fpm.conf, not only the current process.
    up
    6
    ravenswd at gmail dot com
    12 years ago
    Simple, easy way to remove excess trailing zeros using rtrim:
    <php>
    // $total is the result of a bcmath calculation
    if ( strpos($total, '.') !== false ):
    $total = rtrim($total, '0');
    $total = rtrim($total, '.');
    endif;
    </php>
    up
    5
    herslyadam at gmail dot com
    10 years ago
    edited bcround function with negative number support:
    <?php
    function bcround($number, $scale=0) {
    if(    $scale < 0) $scale = 0;
    $sign = '';
    if(    bccomp('0', $number, 64) == 1) $sign = '-';
    $increment = $sign . '0.' . str_repeat('0', $scale) . '5';
    $number = bcadd($number, $increment, $scale+1);
    return     bcadd($number, '0', $scale);
    }
    ?>
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