application/config/form_validation.php

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

$config = array(
    'signup/index' => array(
        array(
            'field' => 'email_address',
            'label' => 'Email Address',
            'rules' => 'trim|required|max_length[255]|valid_email|email_in_use'
        ),
        array(
            'field' => 'password',
            'label' => 'Password',
            'rules' => 'required|min_length[6]'
        ),
        array(
            'field' => 'confirm_password',
            'label' => 'Confirm Password',
            'rules' => 'required|matches[password]'
        ),
    ),
);



application/controllers/signup.php

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

class Signup extends CI_Controller {

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

    public function index() {

        if ($this->form_validation->run()) {
            $this->user_model->insert(array(
                'email_address' => $this->input->post('email_address'),
                'password' => $this->input->post('password'),
            ));

            redirect('/log-in');
        }

        $this->load->view('header');
        $this->load->view('signup/index');
        $this->load->view('footer');
    }

}

/* End of file signup.php */
/* Location: ./application/controllers/signup.php */