Как получить ключ массива?

[windows] => Array
        (
            [2] => Array
                (
                    [id] => 4
                    [width] => 500
                    [height] => 1000
                    [upr] => Справа
                    [quantity] => 1
                    [price] => 500
                )

            [3] => Array
                (
                    [id] => 2
                    [width] => 500
                    [height] => 1000
                    [upr] => Справа
                    [quantity] => 1
                    [price] => 500
                )

            [4] => Array
                (
                    [id] => 3
                    [width] => 500
                    [height] => 1000
                    [upr] => Справа
                    [quantity] => 1
                    [price] => 500
                )

        )

foreach ($array as $key => $value) {
    if ($value['id'] == 3) {
        echo $key; //4
    } elseif ($value['id'] == 4) {
        echo $key; //2
    }
}

$found_key = array_search($okno[0]['id'], array_column($win, 'id'));