Group rows from a CodeIgniter result set by two columns to create a hierarchical multidimensional array

I have table named 'vehicles' in CodeIgniter project.

+----+---------+--------+
| id | name    | make   |
+----+---------+--------+
|  1 | Corolla | Toyota |
|  2 | Parado  | Toyota |
|  3 | Sunny   | Nissan |
|  4 | Maxima  | Nissan |
|  5 | Premoio | Toyota |
+----+---------+--------+

How can I get multi-dimensional array out of that as shown below:

Array
(
    [Toyota] => Array
        (
            [1] => Corolla
            [2] => Parado
            [5] => Premio
        )

    [Nissan] => Array
        (
            [3] => Sunny
            [4] => Maxima
        )
)

Let's assume that you can get all records from table in a array as in $rows variable.

$rows = [
    ['id' => 1, 'name' => 'Corolla', 'make' => 'Toyota'],
    ['id' => 2, 'name' => 'Parado', 'make' => 'Toyota'],
    ['id' => 3, 'name' => 'Sunny', 'make' => 'Nissan'],
    ['id' => 4, 'name' => 'Maxima', 'make' => 'Nissan'],
    ['id' => 5, 'name' => 'Premoio', 'make' => 'Toyota']
];

$result = [];
foreach ($rows as $row) {
    $result[$row['make']][$row['id']] = $row['name'];
}

And just in a single loop you can achieve that. I hope it will help.

CodeIgniter 3.x

$query = $this->db->get('vehicles');

$result = [];
if($this->db->count_all_results() > 0)
{
    foreach ($query->result_array() as $row)
    {
        $result[$row['make']][$row['id']] = $row['name'];
    }
}

echo '<pre>';
print_r($result);
echo '</pre>';