DB query caching and php 7.2

Is it possible that your code is triggering this warning, and that the warning is only happening because you are doing something wrong?

this is an example for a code that will produce the error with PHP 7.2 and CodeIgniter 3.1.6

PHP Code:

        $start = 0;
        $this->db->start_cache();
        $this->db->select('ID, Title, Name, address.city as City, address.state as state')
                 ->from('customers')
                 ->join('address', 'customers.ID = address.CusID')
                 ->order_by('ID', 'ASC');
        $this->db->stop_cache();
        $total = $this->db->count_all_results();
        $ents = $this->db->limit(25, $start)
                         ->get()
                         ->result_array();
        $this->db->flush_cache();