pagination in CodeIgniter php

        $CI=&get_instance();
        // $total_next_records=$total_next_records+$page;
        $cr=$CI->db->query("SELECT res_parent FROM tbl_data.resumes limit $page, $total_next_records");
        $data=$cr->result_array();
        $res_parent = array_column($data, 'res_parent');
        echo ("SELECT res_parent FROM tbl_data.resumes limit $page, $total_next_records")."<br />";

        foreach($data as $key => $item){
            echo $item['res_parent']."<br />";
            //sendNotification($item['res_id'], "New Vacancy Post Added.");
        }
        $page=$page+$total_next_records;
        if(sizeof($data)>1)
            send_notification_in_loop($page,$total_next_records);