bcscale

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

    bcscale — Imposta il valore di precisione di default per tutte le funzioni matematich BCMath

    Descrizione

    bcscale(int $precisione): bool

    Questa funzione imposta il valore di default del parametro precisione per tutte le funzioni BCMath susseguenti, che non specifichino esplicitamente un parametro di precisione numerica. Restituisce true in caso di successo, false in caso di fallimento.

    Esempi

    Example #1 esempio di bcscale()

    <?php

    // precisione di default : 3
    bcscale(3);
    echo     bcdiv(105, 6.55957); // 16.007

    // la stessa cosa, senza utilizzare 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
    17 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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