php - null value for var_dump -


i desired value first var_dump null value both var_dump on submitting form. can me this? precise,i able desired result get->trail->id when form not submitted,but once complete form,and submit it,the value of $id assigned null.

public function trail_cat_cost($trail_unique_code = null) {     if($this->userlib->isloggedin())     {            $code = $trail_unique_code;         $user_id = $this->userlib->getid();         $id = $this->seller_store_model->get_trail_id($code, $user_id);         var_dump($id);         $choice = $this->input->post("travel_cat");         if(is_null($choice))         {             $choice = array();         }         $travel_cat = implode(',', $choice);         $choice1 = $this->input->post("travel_subcat");         if(is_null($choice1))         {             $choice1 = array();         }         $travel_subcat = implode(',', $choice1);          $trail_currency = $this->input->post('trail_currency');         $trail_cost = $this->input->post('trail_cost');         $cost_valid_from = $this->input->post('cost_valid_from');         $cost_valid_upto = $this->input->post('cost_valid_upto');          //$this->form_validation->set_rules('travel_cat', 'travel category', 'trim|required');         //$this->form_validation->set_rules('travel_subcat', 'travel subcategory', 'trim|required');         $this->form_validation->set_rules('trail_currency', 'trail currency', 'trim|required');         $this->form_validation->set_rules('trail_cost', 'trail cost', 'trim|required');         $this->form_validation->set_rules('cost_valid_from', 'cost valid from', 'trim|required');         $this->form_validation->set_rules('cost_valid_upto', 'cost valid upto', 'trim|required');          if($this->form_validation->run() == false)         {                $this->load->view('trail_cat_cost');         }         else         {                var_dump($id);             $this->seller_store_model->trail_cat_cost($user_id, $id, $travel_cat, $travel_subcat, $trail_currency, $trail_cost, $cost_valid_from, $cost_valid_upto);             echo "success";             //redirect('/seller_store/trail_overview/'.$date);         }     }     else     {         echo "user not authorised";     } }

model code comment

public function get_trail_id($code, $user_id) {    $query = $this->db->query("select id trail_basic_info trail_unique_code = '$code' , user_id = '$user_id'"); foreach($query->result() $row) { $id = $row->id; $data = array('trail_id'=>$id); $this->db->update($this->search, $data, array('trail_unique_code'=>$code, 'user_id'=>$user_id)); return $row->id;   }


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