php - 用嵌套计算数组的值

Question

我有以下数组，它是嵌套在更大数组中的一组数组：

Array
(
    [0] => Array
        (
            [vote_for] => 15
        )

    [1] => Array
        (
            [vote_for] => 15
        )

    [2] => Array
        (
            [vote_for] => 15
        )

    [3] => Array
        (
            [vote_for] => 5
        )

    [4] => Array
        (
            [vote_for] => 5
        )

    [5] => Array
        (
            [vote_for] => 2
        )

    [6] => Array
        (
            [vote_for] => 2
        )

    [7] => Array
        (
            [vote_for] => 2
        )

    [8] => Array
        (
            [vote_for] => 2
        )

    [9] => Array
        (
            [vote_for] => 2
        )

    [10] => Array
        (
            [vote_for] => 2
        )

    [11] => Array
        (
            [vote_for] => 2
        )

    [12] => Array
        (
            [vote_for] => 2
        )

    [13] => Array
        (
            [vote_for] => 2
        )

    [14] => Array
        (
            [vote_for] => 2
        )

)

我想在这个数组上做相当于 array_count_values 的操作，这样我得到15 => 3,5 => 2和2 => 10. 我如何取消嵌套数组来做到这一点？

Answer 1

您可能想尝试重新排列您的数组以计数：

$count_array = array();
foreach ($arr as $v) {
   $count_array[] = $v['vote_for'];
}

// Now get the counts
$the_count = array_count_values($count_array);

Answer 2

我认为数组映射也适用于此

$count_array = array_map(function($item) { return $item['vote_for']; }, $array);
$the_count = array_count_values($count_array);