input dinamis

----------------Controller---------------
function administrasi_tambah() {
        if($this->session->userdata('sudah_login_pelamar')){
                        $user=$this->session->userdata('username');
            $config['upload_path'] = './kelengkapan_dokumen/';
            $config['allowed_types'] = 'jpg|pdf';

            $this->load->library('upload', $config);

                if ( ! $this->upload->do_upload()){
                    $array = array( 'content' => $this->load->view('akun_pelamar/gagal','',true) );
               $this->load->view('akun_pelamar/menu', $array);
                }else{
                    $reg['query'] = $this->pelamar_model->tambahkelengkapan();
                        if($reg['query']) {
                            $array = array( 'content' => $this->load->view('akun_pelamar/sukses','',true) );
                            $this->load->view('akun_pelamar/menu', $array);
                        }
                }
        }else {
            redirect('index/index');
            }
        }

---------Model----------------
function tambahkelengkapan() {
        $no=$this->input->post('no_urut');

        $img = $this->upload->data();
        $file_name = "GE".$no."_".$img['file_name'];
        $path = './kelengkapan_dokumen/';
      rename($path.$img['file_name'], $path.$file_name);

      $query1  = $this->db->query("SELECT * FROM form WHERE type != '0'");
      $result = $query1->result();

      $i=0;
      $len=count($result);
      $emprit = "$";
      $emprit .= "data = array(";
      foreach($result as $row){
        if($i == $len - 1) {
            if($row->type == 'file'){
                $emprit .= "'".$row->nama."' => ";
                $emprit .= "$";
                $emprit .= "file_name";
                }else{
                   $emprit .= "'".$row->nama."' => ";
                   $emprit .= "$";
                   $emprit .= "this";
                   $emprit .= "->input->post('".$row->nama."')";
                        }
                }else{
               if($row->type == 'file'){
               $emprit .= "'".$row->nama."' => ";
                $emprit .= "$";
                $emprit .= "file_name,";
                }else{
                    $emprit .= "'".$row->nama."'=> ";
                     $emprit .= "$";
                   $emprit .= "this";
                   $emprit .= "->input->post('".$row->nama."'),";
                }
                }

                $i++;
      }
           $emprit .= ");";

        echo $emprit;
        $query = $this->db->insert('penilaian',$data);
        return $query;
    }