controller

<?php
class Login extends CI_Controller{
  function __construct(){
    parent::__construct();
    $this->load->model('model_login');
    $this->load->model('model_author');
    $this->load->model('model_user');
    $this->load->library('form_validation');
  }
  public function index(){
    $this->load->view('v_login');
  }
  public function auth(){
    $email    = $this->input->post('email',TRUE);
    $password = md5($this->input->post('password',TRUE));
    $validate = $this->model_login->validate($email,$password);
    if($validate->num_rows() > 0){
        $data  = $validate->row_array();
        $name  = $data['user_name'];
        $email = $data['user_email'];
        $level = $data['user_level'];
        $sesdata = array(
            'username'  => $name,
            'email'     => $email,
            'level'     => $level,
            'logged_in' => TRUE
        );
        $this->session->set_userdata($sesdata);
        // access login for admin
        if($level === '1'){
            redirect('page/admin');

        // access login for staff
        }elseif($level === '2'){
            redirect('page/penguji');

        // access login for author
        }else{
            redirect('page/author');
        }
    }else{
        echo $this->session->set_flashdata('pesan','Email atau Password Salah!');
        redirect('login');
    }
  }
  public function tambah(){
    $data = array(
      'dd_univ' => $this->model_author->get_univ(),
      'univ_selected' => $this->input->post('id_univ') ? $this->input->post('id_univ') : '',
      'fakultas_selected' => $this->input->post('id_fakultas') ? $this->input->post('id_fakultas') : '',
      'prodi_selected' => $this->input->post('id_prodi') ? $this->input->post('id_prodi') : ''
    );
    $this->load->view('v_register',$data);
  }
  function get_fakultas(){
    $id_univ = $this->input->post('univ');
    $fakultas = $this->model_author->get_fakultas($id_univ);

    // var_dump($id_univ); die;
    echo '<select name="">';
      echo '<option value="">Pilih Fakultas</option>';
    foreach ($fakultas as $row)
    {
      echo '<option value="'.$row->id_fakultas.'">'.$row->nama_fakultas.'</option>';
    }
    echo '</select>';
  }

  function get_prodi(){
    $id_fakultas = $this->input->post('fakultas');
    $prodi = $this->model_author->get_prodi($id_fakultas);

    echo '<select name="">';
      echo '<option value="">Pilih Prodi</option>';
    foreach ($prodi as $row)
    {
      echo '<option value="'.$row->id_prodi.'">'.$row->nama_prodi.'</option>';
    }
    echo '</select>';
  }

  public function tambah_aksi(){
    $this->form_validation->set_rules('nidn', 'NIDN', 'trim|required|numeric|exact_length[16]');
    $this->form_validation->set_rules('name', 'Nama', 'trim|required');
    $this->form_validation->set_rules('email', 'Email', 'trim|required');
    $this->form_validation->set_rules('password', 'Password', 'required');
    $this->form_validation->set_rules('url_scholar', 'URL Google Scholar', 'trim|required');
    $this->form_validation->set_rules('id_univ', 'Universitas', 'trim|required');
    $this->form_validation->set_rules('id_fakultas', 'Fakultas', 'trim|required');
    $this->form_validation->set_rules('id_prodi', 'Program Studi', 'trim|required');
    $this->form_validation->set_error_delimiters('<span class="text-warning">', '</span>');

    if ($this->form_validation->run() == FALSE)
      $this->session->set_flashdata('pesan','Data Belum Terisi Semua');
      $this->tambah();
    } else {
      $nidn = $this->input->post('nidn');
      $email = $this->input->post('email');
      $name = $this->input->post('name');
      $password = md5($this->input->post('password'));
      $url_scholar = $this->input->post('url_scholar');
      $id_univ = $this->input->post('id_univ');
      $id_fakultas = $this->input->post('id_fakultas');
      $id_prodi = $this->input->post('id_prodi');


    $data_user = array(
      'user_email' => $email,
      'user_password' => $password,
      'user_name' => $name,
      'user_level' => 3
    );
    $user_id = $this->model_user->input_data($data_user,'users');
    $data_author = array(
      'nidn' => $nidn,
      'name' => $name,
      'url_scholar' => $url_scholar,
      'user_id' => $user_id,
      'id_univ' => $id_univ,
      'id_fakultas' => $id_fakultas,
      'id_prodi' => $id_prodi
    );
    $this->model_author->input_data($data_author,'author');
    $this->session->set_flashdata('msg', 'Anda Telah Terdaftar. Silahkan Login');
    redirect('login');
  }
  }
  function logout(){
      $this->session->sess_destroy();
      redirect('login');
  }

}