Multi_insert.php

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Multi_insert extends CI_Controller {

   function __construct()
    {
        parent::__construct();

        $this->load->model('app');
    }

    public function index()
    {
      //jika button simpan di klik
      if ($this->input->post('submit', TRUE) == 'submit') {

         $post = $this->input->post();

         foreach ($post['nama'] as $key => $value) {
            //masukkan data ke variabel array jika kedua form tidak kosong
            if ($post['nama'][$key] != '' || $post['telp'][$key] != '')
            {
               $simpan[] = array(
                  'nama_anggota' => $post['nama'][$key],
                  'telp'         => $post['telp'][$key]
               );
            }
         }

         //simpan data
         $this->app->multi_insert('t_anggota', $simpan);
         //redirect
         redirect('multi_insert');

      }
      //ambil data
      $data['data'] = $this->app->get('t_anggota');
      //load view
        $this->load->view('index', $data);
    }
}