PHP: bcscale - Manual
(PHP 4, PHP 5, PHP 7, PHP 8)
bcscale — Set or get default scale parameter for all bc math functions
Parameters
scale-
The scale factor.
Return Values
Returns the old scale when used as setter. Otherwise the current scale is returned.
Errors/Exceptions
This function throws a ValueError if scale
is outside the valid range.
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
?>Found A Problem?
18 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);
}
?>9 years ago
Executing bcsacle() will change the scale value of fpm.conf, not only the current process.14 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>12 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);
}
?>