return result of recursively executed query using codeigniter -

i new codegniter. have used following code execute function recursively.

in first call pass reply_id in function have used query select id having
parent_id = reply_id in foreach same process selected ids.

now want return combine array recursion.because each id query executed , new result each time.
how can that??

$resultq3 = $this->showreply($reply_id); //first call function  <?php     public function showreply( $reply_id ) {        $q1 =$this->db->select('*')                  ->from('forum_reply fr')                  ->where('fr.parent_id',$reply_id)                  ->order_by('fr.id ')->get();;         foreach( $q1->result_array() $row4 ) {           $id = $row4['id'];             $parent_id = $row4['parent_id'];           if( $parent_id !=0 ) {                 $this->showreply( $id );           }        }        return  $result; //here want return result     }  ?> 

edited code:

$resultq3 = $this->showreply($reply_id); //first call function      <?php         public function showreply( $reply_id ) {            $q1 =$this->db->select('*')                      ->from('forum_reply fr')                      ->where('fr.parent_id',$reply_id)                      ->order_by('fr.id ')->get();;             foreach( $q1->result_array() $row4 ) {                $arr1 = $q1->result_array();               $arr = array_merge($arr, $arr1);                $id = $row4['id'];                 $parent_id = $row4['parent_id'];               if(!empty($arr1)) {                     $this->showreply( $id );               }            }            return $arr;         }      ?> 

just replace code. call functionally single param($replay_id) first time..

<?php     public function showreply($reply_id, $id = array()) {        $q1 =$this->db->select('*')                  ->from('forum_reply fr')                  ->where('fr.parent_id',$reply_id)                  ->order_by('fr.id ')->get();;         foreach( $q1->result_array() $row4 ) {           array_push($id, $row4); //push ever data want            $parent_id = $row4['parent_id'];           if( $parent_id !=0 ) {                 $this->showreply($row4['id'], $id);           }        }         return  $id; //here want return result     }  ?>