How to get value from loop after selecting autocomplete

How to get value from loop after selecting autocomplete

My PHP Code In Model using Codeigniter

           $return_arr =array();
            $new_row =array();
            foreach($query->result_array() as $row)
            {
                $new_row['test_type_id'] = htmlentities(stripslashes($row['test_type_id']));
                $new_row['test_type_name'] = htmlentities(stripslashes($row['test_type_name']));
                $new_row['value'] = htmlentities(stripslashes($row['test_type_name']));
               
                $this->db->select('*');
                $this->db->from('patient_test');
                $this->db->where('test_type_id',$row['test_type_id']);
                $query_tt = $this->db->get();
                $i =0;
                foreach($query_tt->result_array() as $row_tt){
                    $i++;
                   
                    $new_row['per_test_item_id'.$i] = htmlentities(stripslashes($row_tt['id']));
                    $new_row['test_name'.$i] = htmlentities(stripslashes($row_tt['test_name']));
                }
                $new_row['inc_i'] = $i;
                array_push($return_arr,$new_row);
            }
            echo json_encode($return_arr);


My jQuery Code

$('#pathology_test_name').keydown(function () { 
    var id_no_t = document.getElementById('id_no').value; 
    $(this).autocomplete({ 
 source
: "<?php echo base_url(); ?>pathology_con/pathology_test_name_for_adding_result/" + id_no_t, 
 minLength
: 0, 
 autoFocus
: true, 
 select
: function (event, ui) 
 {
 
 var
 tot_i = 5; 
       for (i = 1; i <= tot_i; i++) 
 {
 
 var
 test_name = 'test_name'; 
 test_name 
+= i; 
 
var test_name = ui.item.test_name; 

 $

('<tr class="field" id="row' + per_test_item_id + '">
 <td>'
 + test_name + '</td></tr>').fadeIn('slow').appendTo('#dataTabl2'); 
 }
 
 } 
 
} 
 });
 
});

How can i get test_name value using loop.

If i use separately ui.item.test_name1, ui.item.test_name2 .......etc without loop.

Then Value comes perfect but if i use loop like my above code then value comes undefined.

Please give me the solution.