php递归删除空数组

<?php
function removeEmptyArrays($array) {
    foreach ($array as $key => $value) {
        if (is_array($value)) {
            $array[$key] = removeEmptyArrays($value);
        }
    }
    return array_filter($array, function($value) {
        return !empty($value);
    });
}

// 示例数组
$array = [
    'a' => [],
    'b' => [
        'c' => [],
        'd' => [
            'e' => []
        ]
    ],
    'f' => 'not empty'
];

$result = removeEmptyArrays($array);
print_r($result);
?>

<?php
function removeEmptyArraysIterative($array) {
    $stack = array_merge([$array], array_map('array_values', $array));
    while (!empty($stack)) {
        $current = array_pop($stack);
        foreach ($current as $key => $value) {
            if (is_array($value) && !empty($value)) {
                $stack[] = $value;
            } elseif (is_array($value)) {
                $current[$key] = [];
            }
        }
    }
    return $array;
}

// 示例数组
$array = [
    'a' => [],
    'b' => [
        'c' => [],
        'd' => [
            'e' => []
        ]
    ],
    'f' => 'not empty'
];

$result = removeEmptyArraysIterative($array);
print_r($result);
?>