Validasi

public function validasi() {
        $username = $this->input->post('username', 'true');
        $password = $this->input->post('password', 'true');

        $this->form_validation->set_rules('username', 'Username', 'trim|required|min_length[5]|max_length[20]|xss_clean');
        $this->form_validation->set_rules('password', 'Password', 'trim|required|min_length[5]|max_length[15]|xss_clean');

        $temp_user = $this->session_model->get_user($username)->row();
        $num_user = count($temp_user);

        if ($this->form_validation->run() == FALSE) {
            $this->load->view('login_v');
        } else {
            if ($num_user == 0) { // Username Tidak Terdaftar
                $this->session->set_flashdata('notification','Username Anda tidak Terdaftar, Hubungi Administrator !');
                redirect(site_url('session/login'));
            } elseif ($num_user > 0) { // Username Terdaftar
                $temp_account = $this->session_model->check_user_account($username, sha1($password))->row();
                $num_account = count($temp_account);

                if ($num_account > 0) {
                    $array_item = array('a_user_id' => $temp_account->user_id,
                                        'a_username' => $temp_account->user_username,
                                        'a_nama_lengkap' => $temp_account->user_name,
                                        'a_level' => $temp_account->user_level,
                                        'a_avatar' => $temp_account->user_avatar,
                                        'logged_in_teknik' => TRUE);

                    $this->session->set_userdata($array_item);
                    redirect(site_url('panel/home'));
                } else {
                    $this->session->set_flashdata('notification','LOGIN GAGAL !!, Username and Password Anda Tidak Cocok.');
                    redirect(site_url('session/login'));
                }
            }
        }
    }