php递归数组

$organization = [
    'CEO' => [
        'CTO' => [
            'Frontend Team',
            'Backend Team'
        ],
        'CFO' => [
            'Accounting Team',
            'Finance Team'
        ]
    ],
    'COO' => [
        'Operations Team',
        'HR Team'
    ]
];

function printOrganization($org, $prefix = '') {
    foreach ($org as $key => $value) {
        if (is_array($value)) {
            echo $prefix . $key . "\n";
            printOrganization($value, $prefix . '  ');
        } else {
            echo $prefix . '  ' . $value . "\n";
        }
    }
}

printOrganization($organization);

function printOrganization($org, $prefix = '') {
    if (empty($org)) return;
    foreach ($org as $key => $value) {
        if (is_array($value)) {
            echo $prefix . $key . "\n";
            printOrganization($value, $prefix . '  ');
        } else {
            echo $prefix . '  ' . $value . "\n";
        }
    }
}

function printOrganizationIterative($org, $prefix = '') {
    $stack = [$org];
    while (!empty($stack)) {
        $current = array_pop($stack);
        foreach ($current as $key => $value) {
            if (is_array($value)) {
                echo $prefix . $key . "\n";
                array_push($stack, $value);
            } else {
                echo $prefix . '  ' : . $value . "\n";
            }
        }
    }
}

printOrganizationIterative($organization);