PHP product multidimension array sort based on array Key

Question

I have an array $data['products'][] = array() which is getting data from Database. Now i want to sort this array based on the [catname].

That is all similar [catname] to be grouped/sorted. for ex. all cactus related product to be first and then Special sweets

My Array

$data['products'][] = array(
                    'product_id'  => $result['product_id'],
                    'name'        => $result['name'],
                    'catname'     => $result['catname'],
                    'description' => utf8_substr(trim(strip_tags(html_entity_decode($result['description'], ENT_QUOTES, 'UTF-8'))), 0, $this->config->get('theme_' . $this->config->get('config_theme') . '_product_description_length')) . '..',
                    'price'       => $price,
                );

What i tried is using usort()

function build_sorter($key) {
    return function ($a, $b) use ($key) {
        return strnatcmp($a[$key], $b[$key]);
    };
}

usort($array, build_sorter('catname'));

foreach ($array as $item) {
    echo $item['product_id'] . ', ' . $item['catname'] . "\n";
}

but it is not sorting as desired. Kindly help in getting this correct.

Current ARRAY

Array
(
    [0] => Array
        (
            [product_id] => 119
            [name] => Product 1
            [catname] => Special Sweets
            [description] => This is a sweet
            [price] => $0.00
        )

    [1] => Array
        (
            [product_id] => 56
            [name] => Product 2
            [catname] => cactus
            [description] => description goes here..
            [price] => $0.00
        )

    [2] => Array
        (
            [product_id] => 59
            [name] => Product 3
            [catname] => Special Sweets
            [description] => Corn goes here con..
            [price] => $0.00
        )
     [3] => Array
        (
            [product_id] => 79
            [name] => Product 4
            [catname] => cactus
            [description] => cactus goes here con..
            [price] => $0.00
        )

)

DESIRED ARRAY

Array
(

    [0] => Array
        (
            [product_id] => 56
            [name] => Product 2
            [catname] => cactus
            [description] => description goes here..
            [price] => $0.00
        )

    
     [1] => Array
        (
            [product_id] => 79
            [name] => Product 4
            [catname] => cactus
            [description] => cactus goes here con..
            [price] => $0.00
        )
    [2] => Array
        (
            [product_id] => 119
            [name] => Product 1
            [catname] => Special Sweets
            [description] => This is a sweet
            [price] => $0.00
        )

    [3] => Array
        (
            [product_id] => 59
            [name] => Product 3
            [catname] => Special Sweets
            [description] => Corn goes here con..
            [price] => $0.00
        )
)