如何基于php中的键值对数组进行分组

Question

I have an array. And I have to sort this array and then have to separate it as different array.

Array
(
    [0] => Array
        (
            [brand_id] => 1
            [product_type] => 1

        )

    [1] => Array
        (
            [brand_id] => 2
            [product_type] => 1

        )

     [2] => Array
        (
            [brand_id] => 1
            [product_type] => 1

        )
     [3] => Array
        (
            [brand_id] => 2
            [product_type] => 1

        )
)

I did sorting using usort

function sortByOrder($a, $b) {
            return $a['brand_id'] - $b['brand_id'];
}

usort($product_details, 'sortByOrder');

I need to group this array based on brand_id.

The expected output is.

The name of the array also brand id.

Then I will add it to db as two different records

Array
(
    [0] => Array
        (
            [brand_id] => 1
            [product_type] => 1

        )

    [1] => Array
        (
            [brand_id] => 1
            [product_type] => 1

        )
)

Array
(
    [0] => Array
        (
            [brand_id] => 2
            [product_type] => 1

        )

    [1] => Array
        (
            [brand_id] => 2
            [product_type] => 1
        )
)

Answer 1

You can use extract to create dynamic array,

/* after your sorting logic */
$result = [];
foreach ($product_details as $key => $value) {
    // grouping data as per brand id
    $result['brand_id'.$value['brand_id']][] = $value;
}
extract($result);
print_r($brand_id1);
print_r($brand_id2);

Working Demo .

Output:-

Array
(
    [0] => Array
        (
            [brand_id] => 1
            [product_type] => 1
        )

    [1] => Array
        (
            [brand_id] => 1
            [product_type] => 1
        )

)
Array
(
    [0] => Array
        (
            [brand_id] => 2
            [product_type] => 1
        )

    [1] => Array
        (
            [brand_id] => 2
            [product_type] => 1
        )

)