PHP中计算百分比时如何保证各部和为1?

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Release: 2016-06-23 14:10:33
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$total = $a+$b+$c+$d;$percentA = ceil($a*100.0/$total);$percentB = ceil($b*100.0/$total);$percentC = ceil($c*100.0/$total);$percentD = ceil($d*100.0/$total);
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上面的代码似乎无法确保最后的总和是100%

$percentD = 100-$percentA-$percentB-$percentC;
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除了这种方法,有其他方法吗?


回复讨论(解决方案)

不要小数吗?
另外你这没有四舍五入,是需要的吗?
$percentA = round($a*100.0/$total);

不要小数吗?
另外你这没有四舍五入,是需要的吗?
$percentA = round($a*100.0/$total);

是要四舍五入的

$a = array(1,2,3,3);$total = array_sum($a);array_walk($a, function(&$item, $key, $prefix) { $item = round($item*100/$prefix); }, $total);if($d = (100 - array_sum($a))) $a[rand(0, count($a)-1)] += $d;print_r($a);
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$a = array(1,2,3,3);$total = array_sum($a);array_walk($a, function(&$item, $key, $prefix) { $item = round($item*100/$prefix); }, $total);if($d = (100 - array_sum($a))) $a[rand(0, count($a)-1)] += $d;print_r($a);
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多谢

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