如何在php中从嵌套数组中获取循环数据

$array = [
    'key1' => [
        'value1',
        'value2',
        'value3'
    ],
    'key2' => [
        'value4',
        'value5',
        'value6'
    ]
];

foreach ($array as $key => $values) {
    foreach ($values as $value) {
        echo $value . "\n";
    }
}

function printNestedArray($array) {
    foreach ($array as $key => $value) {
        if (is_array($value)) {
            printNestedArray($value);
        } else {
            echo $value . "\n";
        }
    }
}

$array = [
    'key1' => [
        'value1',
        'value2',
        'value3'
    ],
    'key2' => [
        'value4',
        'value5',
        'value6'
    ]
];

printNestedArray($array);