array(0) {

<?php echo form_open("auth/login");?>
                                <div class="form-group">
                                    <div class="input-group">
                                        <span class="input-group-addon"><i class="fa fa-user"></i>
                                        </span>
                                        <?php echo form_input($identity);?>
                                    </div>
                                </div>
                                <div class="form-group">
                                    <div class="input-group">
                                        <span class="input-group-addon"><i class="fa fa-lock"></i>
                                        </span>
                                        <?php echo form_input($password);?>
                                    </div>
                                </div>
                                <button type="submit" class="btn btn-primary text-theme-xs mr-8">Login</button>
                                <?php echo form_checkbox('remember', '1', FALSE, 'id="remember"');?>
                                <a href="<?= site_url('auth/forgot_password') ?>" class="text-theme-xs pull-right a-black">Forgot your password ?</a>
                            </form>

function login()
{
    $this->data['title'] = "Login";

    //validate form input
    $this->form_validation->set_rules('identity', 'Identity', 'required');
    $this->form_validation->set_rules('password', 'Password', 'required');

    if ($this->form_validation->run() == true)
    {
        //check to see if the user is logging in
        //check for "remember me"
        $remember = (bool) $this->input->post('remember');

        if ($this->ion_auth->login($this->input->post('identity'), $this->input->post('password'), $remember))
        {
            //if the login is successful
            //redirect them back to the home page
            $this->session->set_flashdata('message', $this->ion_auth->messages());
            redirect('/', 'refresh');
        }
        else
        {
            //if the login was un-successful
            //redirect them back to the login page
            $this->session->set_flashdata('message', $this->ion_auth->errors());
            redirect('auth/login', 'refresh'); //use redirects instead of loading views for compatibility with MY_Controller libraries
        }
    }
    else
    {
        //the user is not logging in so display the login page
        //set the flash data error message if there is one
        $this->data['message'] = (validation_errors()) ? validation_errors() : $this->session->flashdata('message');

        $this->data['identity'] = array('name' => 'identity',
            'id' => 'identity',
            'type' => 'text',
                            'class' => 'form-control',
            'value' => $this->form_validation->set_value('identity'),
                            'placeholder' => 'Username',
        );
        $this->data['password'] = array('name' => 'password',
            'id' => 'password',
            'type' => 'password',
                            'class' => 'form-control',
                            'placeholder' => 'Password',
        );
                    $this->_render_page('templates/head', $this->data);
        $this->_render_page('templates/navbar', $this->data);
                    $this->_render_page('auth/login', $this->data);
                    $this->_render_page('templates/footer', $this->data);
    }
}

<form action="http://www.mydomain.uk/auth/login" method="post" accept-charset="utf-8">

  <p>
    <label for="identity">Email/Username:</label>    <input type="text" name="identity" value="" id="identity" class="form-control" placeholder="Username"  />
  </p>

  <p>
    <label for="password">Password:</label>    <input type="password" name="password" value="" id="password" class="form-control" placeholder="Password"  />
  </p>

  <p>
    <label for="remember">Remember Me:</label>    <input type="checkbox" name="remember" value="1" id="remember" />
  </p>


  <p><input type="submit" name="submit" value="Login"  />
</p>

</form>