获取第n级多维数组PHP中key的值

function getArrayValueByLevel($array, $level, $currentLevel = 1) {
    foreach ($array as $key => $value) {
        if ($currentLevel == $level) {
            echo "第{$level}级多维数组的key的值为：{$key}\n";
        } else {
            if (is_array($value)) {
                getArrayValueByLevel($value, $level, $currentLevel + 1);
            }
        }
    }
}

// 示例多维数组
$array = array(
    'key1' => 'value1',
    'key2' => array(
        'key3' => 'value3',
        'key4' => array(
            'key5' => 'value5',
            'key6' => 'value6'
        )
    ),
    'key7' => 'value7'
);

// 获取第2级多维数组的key的值
getArrayValueByLevel($array, 2);

第2级多维数组的key的值为：key3
第2级多维数组的key的值为：key4