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);
}
?>
bcscale
(PHP 4, PHP 5, PHP 7)
bcscale — 모든 bc 수학 함수의 기본 scale 인수값 설정
설명
bool bcscale
( int
$scale
)scale 인수를 명시하지 않는 모든 bc 수학 함수의 기본 scale 인수값을 설정합니다.
인수
-
scale -
소수점 아래 자리수
반환값
성공 시 TRUE를, 실패 시 FALSE를 반환합니다.
예제
Example #1 bcscale() 예제
<?php
// 기본 자리수 : 3
bcscale(3);
echo bcdiv('105', '6.55957'); // 16.007
// bcscale() 없이 동일한 결과
echo bcdiv('105', '6.55957', 3); // 16.007
?>
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User Contributed Notes 4 notes
mwgamera at gmail dot com ¶
17 years ago
sicerwork at aliyun dot com ¶
7 years ago
Executing bcsacle() will change the scale value of fpm.conf, not only the current process.
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>
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);
}
?>
