Recursive Function not working In codeIgniter - php

Question

I am trying to get all categories with related parent ID with a recursive function.
If i print that array its showing me all data but if i want to return this is not working. I am sure i am doing some mistake.
My code for recursive function is:
public function get_child($id,$level=0){
//$level=0;
$this->db->select('*');
$this->db->from('whole_category');
$this->db->where('parent_id',$id);
$this->db->order_by("id", "ASC");
$query = $this->db->get();
if ($query->num_rows() > 0) {
$res= $query->result();
echo $current_node_id=$res[0]->id;
$level++;
$this->get_child($current_node_id,$level);
$cat["level".$level][] =$res;
return $cat;
}else{
return $cat;
}
}
Calling it like:
public function getcategories(){
echo "<pre>";
$a=$this->get_child(1);
var_dump($a);
}

Answer 1

I had created a Recursive function for a Multi level Marketing Project
Please try it.
public function getSubMembers($memberID, $tableName = 'member_master') {
$data = arra[enter image description here][1]y();
$strQuery = "select MEMBER_ID,LOGIN_NAME,FIRSTNAME,LASTNAME,SPONSOR,PARENT_ID,PAYMENT_STATUS from member_master where SPONSOR='" . $memberID . "' order by POSITION ";
$result = mysqli_query($this->conn, $strQuery);
if (mysqli_field_count($this->conn)) {
while ($row = mysqli_fetch_assoc($result)) {
$data[$row['LOGIN_NAME']] = $row;
foreach ($data as $values) {
$data[$values['LOGIN_NAME']]['SUB'] = $this->getSubMembers($values['LOGIN_NAME']);
}
}
}
return $data;
}