CodeIgniter Authentication Library , application/libraries/auth.php

auth.php

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

class Auth  {
	/**
	*	@author K.Gautam
	*	@version 0.1
	*	@todo ability to add configuration.
	*/
	protected $CI=NULL;

	/**
	*	Get CodeIgniter Instance and 
	*	Load necessary libraries
	*/
	public function __construct(){
		$this->CI =& get_instance();
		$this->CI->load->library('session');
	}

	/**
	*	Start the session and set session variables.
	*	@param email address of the user to store on the session
	*/
	public function login_user($email){
		
		$this->CI->session->set_userdata(array(
			'email_address' => $email_address,
			'logged_in' => TRUE,
			 ));
	}

	/**
	*	Logout user by deleting session information
	*/
	public function logout_user(){
		/*
			Logout user by unsetting the data
		*/
		$this->CI->session->unset_userdata('email_address');
		$this->CI->session->unset_userdata('logged_in');
	}

	/**
	*	check if the user is logged in
	*	@return TRUE if data is available and the user is logged in 
	*			else if data is not available it by default returns false
	*/
	public function is_logged_in(){
		return $this->CI->session->userdata("logged_in");
	}

}
/* End of file */