如何将动态生成的数组的键值相加并得到它们的平均值？

Question

我正在为每个循环生成一个值数组。结果看起来有点像我在下面粘贴的数组值。现在我想添加三个迭代的相应值并得到它们的平均值......就像我想要的第 0 个键 - (87+95.2+100)/3 ... 像这样我想要所有的值.. 如何我该怎么做？

这是代码。 $items 包含我在下面粘贴的这些数组值。每个循环有两个，我必须想办法获得平均值。

foreach ($data['data'] as $k => $v) 
   {
     $items = array();
      foreach ($data['departments'] as $a => $b) 
      {
        $items[] = $v['departments'][$a]['score'];
   }
   }
   echo "<pre>";
   print_r($items);
   echo "</pre>";

当我打印出来时，$items 包含以下内容

    Array
(
    [0] => 87
    [1] => 88.90000000000001
    [2] => 97.40000000000001
    [3] => 27.4
    [4] => 94.7
    [5] => 91.7
    [6] => 93.90000000000001
    [7] => 100
    [8] => 0
    [9] => 100
    [10] => 94.40000000000001
    [11] => 90
    [12] => 100
    [13] => 78.59999999999999
    [14] => 63.3
    [15] => 97.40000000000001
    [16] => 96.90000000000001
    [17] => 97
)
Array
(
    [0] => 95.2
    [1] => 94.7
    [2] => 95
    [3] => 33.6
    [4] => 94.8
    [5] => 100
    [6] => 92.3
    [7] => 78.59999999999999
    [8] => 92.3
    [9] => 96.40000000000001
    [10] => 92.5
    [11] => 100
    [12] => 96.3
    [13] => 84.09999999999999
    [14] => 63
    [15] => 97.7
    [16] => 94.3
    [17] => 97.09999999999999
)
Array
(
    [0] => 100
    [1] => 95
    [2] => 91.90000000000001
    [3] => 33.6
    [4] => 98.2
    [5] => 96.3
    [6] => 97.90000000000001
    [7] => 86.7
    [8] => 91.7
    [9] => 96.59999999999999
    [10] => 92.5
    [11] => 100
    [12] => 92.3
    [13] => 83.3
    [14] => 63.6
    [15] => 92.90000000000001
    [16] => 94.40000000000001
    [17] => 98.59999999999999
)

Answer 1

<?php
$items = array();
foreach ($data['data'] as $k => $v)  {
    foreach ($data['departments'] as $a => $b) {
        $items[$k][] = $v['departments'][$a]['score'];
    }
}

$res = array_map('average', zip($items));

var_dump($res);

function zip($arrays) {
    $zip = [];
    if ($arrays) {
        $count = count(current($arrays));
        for ($i = 0; $i < $count; $i++) {
            foreach ($arrays as $array) {
                $zip[$i][] = $array[$i];
            }
        }
    }
    return $zip;
}

function average($numbers) {
    return array_sum($numbers) / count($numbers);
}