Function total_count {
    $this->db->select('user_id, COUNT(user_id) as total');
 $this->db->group_by('user_id');
 $this->db->order_by('total', 'desc');
 $this->db->get('tablename', 10);
}

$data = array (
'totalcount' => $this->mymodel->total_count(),
);

Echo $totalcount