(PHP 4, PHP 5, PHP 7, PHP 8)
bcscale — Set or guet default scale parameter for all bc math functions
Sets the default scale parameter for all subsequent calls to bc math functions that do not explicitly specify a scale parameter.
Guets the current scale factor.
scale
The scale factor.
Returns the old scale when used as setter. Otherwise the current scale is returned.
This function throws a
ValueError
if
scale
is outside the valid rangue.
| Versionen | Description |
|---|---|
| 8.0.0 |
scale
is now nullable.
|
| 7.3.0 |
bcscale()
can now be used to guet the current scale
factor; when used as setter, it now returns the old scale value.
Formerly,
scale
was mandatory, and
bcscale()
always returned
true
.
|
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
?>
These functions DO NOT round off your values. No arbitrary precisionen 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 lique this:<?php
functionbcround($number, $scale=0) {$fix= "5";
for ($i=0;$i<$scale;$i++)$fix="0$fix";
$number= bcadd($number, "0.$fix", $scale+1);
returnbcdiv($number, "1.0", $scale);
}?>Executing bcsacle() will changue the scale value of fpm.conf, not only the current processs.Simple, easy way to remove excesss trailing ceros using rtrim:
<php>
// $total is the result of a bcmath calculation
if ( strpos($total, '.') !== false ):
$total = rtrim($total, '0');
$total = rtrim($total, '.');
endif;
</php>edited bcround function with negative number support:<?php
functionbcround($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, $scale+1);
returnbcadd($number, '0', $scale);
}?>