ci4 array 헬퍼의 array_sort_by_multiple_keys() 함수를 사용하시면 될것 같습니다.

@한대승(불의회상

작업 환경이 CI3인데 3버전에는 없는 것 같은데, 다른 방법이 있을까요?

function array_sort_by_multiple_keys(array &$array, array $sortColumns): bool
{
    // Check if there really are columns to sort after
    if (empty($sortColumns) || empty($array))
    {
        return false;
    }

    // Group sorting indexes and data
    $tempArray = [];
    foreach ($sortColumns as $key => $sortFlag)
    {
        // Get sorting values
        $carry = $array;

        // The '.' operator separates nested elements
        foreach (explode('.', $key) as $keySegment)
        {
            // Loop elements if they are objects
            if (is_object(reset($carry)))
            {
                // Extract the object attribute
                foreach ($carry as $index => $object)
                {
                    $carry[$index] = $object->$keySegment;
                }

                continue;
            }

            // Extract the target column if elements are arrays
            $carry = array_column($carry, $keySegment);
        }

        // Store the collected sorting parameters
        $tempArray[] = $carry;
        $tempArray[] = $sortFlag;
    }

    // Append the array as reference
    $tempArray[] = &$array;

    // Pass sorting arrays and flags as an argument list.
    return array_multisort(...$tempArray);
}

PHP 7.x 버전이니 버전에 맞추어서 수정해 쓰시면됩니다.