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//  in /views/includes
<?php $this->load->view('includes/header'); ?>

<?php $this->load->view($main_content); ?>

<?php $this->load->view('includes/footer'); ?>

// in /controllers
<?php

class Site extends CI_Controller {
	
	function __construct() {
		parent::__construct();
		$this->is_logged_in();
	}
	
	function members_area() {
		$this->load->view('members_area');
	}
	
	function is_logged_in() {
		$is_logged_in = $this->session->userdata('is_logged_in');
		
		if (!isset($is_logged_in) || $is_logged_in !== true) {
			echo 'You don\'t have permission to access this page. <a href="../login">Login</a>';
			die();
		}
	}
}

//  in /views
<h1>Congrats!</h1>
<p>Your account has been created. <?php echo anchor('login', 'Login Now'); ?></p>

//  in /views
<h1>Create an Account</h1>

<fieldset>
	<legend>Personal Information</legend>
	
	<?php
	
	echo form_open('login/create_member');
	echo form_input('first_name', set_value('first_name', 'First Name'));
	echo form_input('last_name', set_value('last_name', 'Last Name'));
	echo form_input('email_address', set_value('email_address', 'Email Address'));
	
	?>
	
</fieldset>
	<legend>Login Info</legend>

	<?php
	
	echo form_input('username', set_value('username', 'Username'));
	echo form_input('password', 'Password');
	echo form_input('password2', 'Confirm Password');
	
	echo form_submit('submit', 'Create Account');
	
	?>
	
	<?php echo validation_errors('<p class="error">') ?>
	
</fieldset>

//  in /models

<?php

class Membership_model extends CI_Model {
	
	function validate() {
		$this->db->where('username', $this->input->post('username'));
		$this->db->where('password', md5($this->input->post('password')));
		$query = $this->db->get('membership');
		
		if($query->num_rows() == 1) {
			return true;			
		}
	}
	
	function create_member() {
		$new_member_insert_data = array(
			'first_name' => $this->input->post('first_name'),
			'last_name' => $this->input->post('last_name'),
			'email_address' => $this->input->post('email_address'),
			'username' => $this->input->post('username'),
			'password' => md5($this->input->post('password'))
		);
		
		$insert = $this->db->insert('membership', $new_member_insert_data);
		return $insert;
	}
	
}

//  in /views
members area only

//  in /views
<div id="login form">
	<h1>Login!</h1>
	
	<?php
	
  	echo form_open('login/validate_credentials');
  	echo form_input('username', 'Username');
  	echo form_password('password', 'Password');
  	echo form_submit('submit', 'Login');
  	echo anchor('login/signup', 'Create Account');
	
	?>
	
</div>

// in /controllers
<?php

class Login extends CI_Controller {
	
	function index() {
		$data['main_content'] = 'login_form';
		$this->load->view('includes/template', $data);
	}
	
	function validate_credentials() {
		$this->load->model('membership_model');
		$query = $this->membership_model->validate();
	
		if ($query) {
			$data = array(
				'username' => $this->input->post('username'),
				'is_logged_in' => true
			);
			
			$this->session->set_userdata($data);
			redirect('site/members_area');
		} else {
			$this->index();
		}
	}
	
	function signup() {
		$data['main_content'] = 'signup_form';
		$this->load->view('includes/template', $data);
	}
	
	function create_member() {
		$this->load->library('form_validation');
		
		$this->form_validation->set_rules('first_name', 'First Name', 'trim|required');
		$this->form_validation->set_rules('last_name', 'Last Name', 'trim|required');
		$this->form_validation->set_rules('email_address', 'Email', 'trim|required|valid_email');
		$this->form_validation->set_rules('username', 'Username', 'trim|required|min_length[4]');
		$this->form_validation->set_rules('password', 'Password', 'trim|required|min_length[4]|max_length[32]');
		$this->form_validation->set_rules('password2', 'Confirm Password', 'trim|required|matches[password]');
		
		if ($this->form_validation->run() == FALSE) {
			$this->signup();
		} else {
			$this->load->model('membership_model');
			if ($query = $this->membership_model->create_member()) {
				$data['main_content'] = 'signup_successful';
				$this->load->view('includes/template', $data);
			} else {
				$this->signup();
			}
		}
	}	
}