bcscale

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

bcscale — Establece los parametros de scale por defecto para todas las funciones matemáticas de bc

Descripción

bcscale(int $scale): bool

Establece los parametros de scale para todas las subsiguientes llamadas a funciones matemáticas bc, donde no se especifica el parametro de scale.

Parámetros

scale: El factor scale.

Valores devueltos

Devuelve true en caso de éxito o false en caso de error.

Ejemplos

Ejemplo #1 Ejemplo bcscale()

<?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

down

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);
        }
?>

down

sicerwork at aliyun dot com ¶

7 years ago

Executing bcsacle() will change the scale value of fpm.conf, not only the current process.

down

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>

down

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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