在多维php数组中求和值
我试图找出如何处理数组,以便对其值进行“计算”。 该阵列看起来与此类似:在多维php数组中求和值,php,arrays,math,multidimensional-array,divide,Php,Arrays,Math,Multidimensional Array,Divide,我试图找出如何处理数组,以便对其值进行“计算”。 该阵列看起来与此类似: Array ( [0] => Array ( [person1] => 71 [person2] => 49 [person3] => 15 ) [1] => Array ( [person1] => 56 [person3] => 43 [person4] =
Array
(
[0] => Array
(
[person1] => 71
[person2] => 49
[person3] => 15
)
[1] => Array
(
[person1] => 56
[person3] => 43
[person4] => 21
[person5] => 9
[person6] => 7
)
...
)
每个值应除以总金额:
因此,第一个值应为71/(71+49+15)=0.526或52.6%
数值应四舍五入至小数点后3位。有人能为我提供一个array_walk(或foreach)函数吗?我就是搞不懂
最后一个数组应该如下所示:
Array
(
[0] => Array
(
[person1] => 52.6%
[person2] => 36.3%
[person3] => 11.1%
)
[1] => Array
(
[person1] => 41.2%
[person3] => 31.6%
[person4] => 15.4%
[person5] => 6.6%
[person6] => 5.1%
)
...
)
谢谢 您可以使用将这些值相加,然后计算每个值的比率/百分比,并添加到新数组中:
$output = array();
foreach($array as $key => $current) {
$total = array_sum($current);
$output[$key] = array();
foreach($current as $person => $value) {
// decimal: round to 3 places
$output[$key][$person] = round($value / $total, 3);
// if you want a percentage, round to another 1 place (as per your example):
// $output[$key][$person] = round($output[$key][$person] * 100, 1) . '%';
}
}
编辑:数组_walk()变体:
$data = array(
array(
'person1' => 71,
'person2' => 49,
'person3' => 15,
),
array(
'person1' => 56,
'person3' => 43,
'person4' => 21,
'person5' => 9,
'person6' => 7,
),
);
array_walk(
$data,
function (&$value) {
$sum = array_sum($value);
array_walk(
$value,
function (&$value) use ($sum) {
$value = round($value / $sum, 3) * 100 . '%';
}
);
}
);
var_dump($data);
请注意,array_walk()修改了原始数组;如果希望保持不变,请改用array_map()假设
$arr
是您的初始数组,而$new_arr
将是新数组
$new_arr = array();
foreach ($arr as $i=>$ar)
foreach ($ar as $j=>$a)
$new_arr[$i][$j] = round(($a/array_sum($ar))*100, 1);
愿意分享你尝试过的东西吗?此外,您说“四舍五入到小数点后3位”,但您的示例显示小数点后1位。到底应该是哪一个?@JayBlanchard:他们想要的结果百分比的小数点后一位。太棒了@(尸体)是的,百分比的小数点后一位。我尝试将
foreach($k=>v)与array\u sum()
结合使用,但实际效果并不理想。我不知道如何获取第二维度的值并重新计算它们