将特定多维数组键的值转换为新数组中的键，并将原始数组作为值

Basically I just would like to know if there is a built-in way of doing this, that might be faster, like maybe with an array_map callback or something:

基本上我只是想知道是否有一种内置的方法，这可能会更快，就像使用array_map回调或其他东西：

function array_rekey($a, $column)
{
    $array = array();
    foreach($a as $keys) $array[$keys[$column]] = $keys;
    return $array;
}

1 个解决方案

#1

This should work for you:

这应该适合你：

Just pass NULL as second argument to array_column() to get the full array back as values and use $column as third argument for the keys.

只需将NULL作为第二个参数传递给array_column（）以将完整数组作为值返回，并使用$ column作为键的第三个参数。

$result = array_column($arr, NULL, $column);

example input/output:

示例输入/输出：

$arr = [
        ["a" => 1, "b" => 2, "c" => 3],
        ["a" => 4, "b" => 5, "c" => 6],
        ["a" => 7, "b" => 8, "c" => 9],
    ];

$column = "b";
$result = array_column($arr, NULL, $column);
print_r($result);

output:

输出：

Array
(
    [2] => Array
        (
            [a] => 1
            [b] => 2
            [c] => 3
        )

    [5] => Array
        (
            [a] => 4
            [b] => 5
            [c] => 6
        )

    [8] => Array
        (
            [a] => 7
            [b] => 8
            [c] => 9
        )

)

#1