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if ($this->erkanaauth->try_login('username'=>$username, 'password'=>$password)){

if ($this->erkanaauth->try_login(array('username'=>$username), array('password'=>$password))){

var $config = array(
                        'user_tbl' => 'users', 
                        'role_tbl' => 'roles', 
                        'user_rows' => array(
                                            'name'     => 'user_name',
                                            'pass'     => 'user_pass',
                                            'email' => 'user_email',
                                            'role'    => 'user_role'
                                            )
                        );

user_tbl  = The name of your "user" table
role_tbl  = The name of your "role" table
user_rows = This is where you clarify the most COMMON user rows.
user_rows are used in such manner:
    'base name' => 'table column / row name'

/**
    * Create a user account By DarkGrave
    * With Roles & Autologin. Good for forms.
    *
    * @access    public
    * @param    public array conditions
    * @param    bool
    * @return    bool
    */
    function createUser($user = array(), $role=1, $auto_login=true) {
        $this->CI =& get_instance(); // For PHP 4 USERS.
        
        // Make sure account info was sent
        if(($user['name'] == '') OR ($user['pass'] == '') OR ($user['email'] == '')) {
            return 1; // 1 = Insufficient Information.
        } else {
            $user_name     = $user['name'];
            $user_pass     = $user['pass'];
            $user_email    = $user['email'];
        }
        
        // Check against user table
        $this->CI->db->where($this->config['user_rows']['name'], $user_name);
        $query = $this->CI->db->getwhere($this->config['user_tbl']);
        
        if ($query->num_rows() > 0) {
            return 2; //Username already exists
        } else {
            $password = md5($user['pass']); //Encrypt password
            
            // Insert account into the database
            $data = array(
                            $this->config['user_rows']['name']     => $user_name,
                            $this->config['user_rows']['pass']     => $user_pass,
                            $this->config['user_rows']['email']    => $user_email,
                            $this->config['user_rows']['role']    => $role
                        );
            $this->CI->db->set($data);
            
            if(!$this->CI->db->insert($this->config['user_tbl'])) {
                return 3; // Problem inserting data into the database.
            }
            $user_id = $this->CI->db->insert_id();
            
            // Automatically login to created account
            if($auto_login){ 
                $this->erkanaauth->try_login(
                                                array($this->config['user_rows']['name']=>$username), 
                                                array($this->config['user_rows']['pass']=>$password)
                                            ); 
            }
            
            // Creation was successfull.         
            return 4; // Make sure you check for 4 not TRUE.
        }
    }

$result = $this->erkanaauth->createUser(array('name'=>'DarkGrave','pass'=>'test','email'=>'[email protected]'),1,false);
if($result == 4){
    echo 'Successfully added user!';
} else {
    echo 'Failed to add user!';
}

function getUser($id = $this->CI->session->userdata('user_id')) {
        if ($id) {
            $query = $this->CI->db->getwhere('users', array('users.id'=>$id), 1, 0);
            if ($query->num_rows() == 1) {
                return $query->row();
            } else {
                return FALSE;
            }
        } else {
            return FALSE;
        }
    }

function __construct() {
        parent::Controller();
        $this->data->user = $this->auth->getUser();
    }

    // This function is available to anyone:
    function index() {
        $this->load->view('index', $this->data);
    }

    // This function is only available to logged in users
    function admin() {
        if (!$this->data->user) redirect('');
        $this->load->view('admin', $this->data);
    }

function admin() {
        if ($this->data->user->role != 'admin') redirect('');
    }

/**
    * Delete user(s) - Function by DarkGrave
    *
    * @access     public
    * @param    integer or Array of integers.
    * @return    bool
    */
    function deleteUser($user_id) {
        $this->CI =& get_instance(); //Put here for PHP 4 users
        
        if(!is_array($user_id)){
            if(!is_numeric($user_id)){
                return 1; // Id not numerical.
            }

            if($this->CI->db->delete($this->config['user_tbl'], array($this->config['user_rows']['id'] => $user_id))) {
                return 2; //Database call was successful, user was deleted.
            } else {
                return 3; // Couldn't find user by that id.
            }
        } else {
            $deleted = array();
            
            foreach($user_id as $id){
                if(!is_numeric($id)){
                    continue; // Id not numerical.
                }

                if($this->CI->db->delete($this->config['user_tbl'], array($this->config['user_rows']['id'] => $id))) {
                    $deleted[$id] = $id; //Database call was successful, user was deleted.
                }
            }
            
            return $deleted;
        }
    }

'id'    => 'id',

// Single Deletion
        $result = $this->erkanaauth->deleteUser(1);
        if($result == 2){
            echo "Deleted User.";
        }

        // Array Deletion
        $result = $this->erkanaauth->deleteUser(array(2,3,4));
        foreach($result as $deleted_user_id){
            echo "User ".$deleted_user_id." was deleted";
        }

class Erkanaauth extends Model{

    var $db_table = 'users';
    var $db_userid = 'id';

    function Erkanaauth()
    {
    
        parent::Model();
        log_message('debug',
            'Authorization class initialized (model Erkanaauth).');
    }

    function try_login($condition = array())
    {
        $query = $this->db->getwhere($this->db_table, $condition, 1, 0);
        
        if ($query->num_rows != 1) return FALSE;
        
        $row = $query->row();
        $this->session->set_userdata(array('user_id'=>$row->id));
        
        return $row;
    }

    function getUser($id = FALSE)
    {
        if ($id == FALSE) $id = $this->session->userdata('user_id');
        
        if ($id == FALSE) return FALSE;
        
        $condition = array(($this->db_table .'.' .$this->db_userid) =>$id);
        
        $query = $this->db->getwhere($this->db_table, $condition, 1, 0);
        
        $row = ($query->num_rows() == 1) ? $query->row() : FALSE;
        
        return $row;
        }
    
    function logout()
    {
        $this->session->set_userdata(array('user_id'=>FALSE));
    }

$this->load->library('Erkanaauth');
        if (!$this->erkanaauth->try_session_login()) {
            redirect('/login');
          }