使用预定义的键转置 PHP 多维数组 [英] Transpose a PHP multidimensional array with predefined keys

问题描述

我有一个带有 3 个键(长度"、宽度"和高度")的多维数组.每个键都与一个值数组相关联:

I have a multidimensional array with 3 keys ("length", "width" and "height). Each key is associated with an array of values:

$data = [
    "length" => ["12", "44"],
    "width" => ["22", "45"],
    "height" => ["22", "34"]
];

如何将每个键的列转换为 3 列的行，如下所示:

How can I transpose the columns of each key into rows of 3 columns as follows:

$rows = [
    ["length" => "12", "width" => "22", "height" => "22"],
    ["length" => "44", "width" => "45", "height" => "34"]
]; 

推荐答案

以下函数将完成这项工作:

The following function will do the job:

function transpose($data)
{
    $result = [];
    $keys = array_keys($data);
    for ($row = 0,  $rows = count(reset($data)); $row < $rows; $row++) {
        foreach ($keys as $key) {
            $result[$row][$key] = $data[$key][$row];
        }
    } 

    return $result;
}

请注意，该函数是一个通用解决方案，它不依赖于键的名称，也不依赖于每个键的条目数.

Notice that the function is a general solution it doesn’t depend on the name of the keys nor on the number of entries of each key.

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