根据父 ID 值将数组从一维转换为多维

function array_walk_recursive($array, $func) {
    if (is_array($array)) {
        foreach ($array as $key => $value) {
            $func($value, $key);
            array_walk_recursive($value, $func);
        }
    }
}

$oneDimensionalArray = array(1, 2, 3, 4);
$multiDimensionalArray = array();
array_walk_recursive($oneDimensionalArray, function ($v, $k) use (&$multiDimensionalArray) {
    $multiDimensionalArray[] = array($v, $k);
});
print_r($multiDimensionalArray);

Array
(
    [0] => Array
        (
            [0] => 1
            [1] => 0
        )

    [1] => Array
        (
            [0] => 2
            [1] => 1
        )

    [2] => Array
        (
            [0] => 3
            [1] => 2
        )

    [3] => Array
        (
            [0] => 4
            [1] => 3
        )

)

function array_reduce_recursive($array, $callback) {
    $result = array();
    array_walk_recursive($array, function ($v, $k) use ($callback, $result) {
        $result[] = $callback($v, $k);
    });
    return $result;
}

$multiDimensionalArray = array(array(1, 0), array(2, 1), array(3, 2), array(4, 3));
$oneDimensionalArray = array_reduce_recursive($multiDimensionalArray, function ($v, $k) {
    return $v[0] . $v[1] . $k;
});
print_r($oneDimensionalArray);

Array
(
    [0] => 102
    [1] => 103
    [2] => 104
)