如何在php中将多维数组转换为一维数组？

function flattenArray($array) {
    $result = array();
    foreach ($array as $value) {
        if (is_array($value)) {
            $result = array_merge($result, flattenArray($value));
        } else {
            $result[] = $value;
        }
    }
    return $result;
}

$multidimensionalArray = array(
    1,
    array(2, 3),
    array(
        4,
        array(5, 6),
        7
    ),
    8
);

$flattenedArray = flattenArray($multidimensionalArray);
print_r($flattenedArray);

Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
    [5] => 6
    [6] => 7
    [7] => 8
)