Membuat authentikasi (login, register, lupa password)

function login()
{		
	$fields['username'] = "Username";
	$fields['password'] = "Password";
	$this->validation->set_fields($fields);
 
	if($this->input->post("login"))
	{
		$rules['username']	= "trim|required";
		$rules['password'] 	= "trim|required|callback_login_check";
		$this->validation->set_rules($rules);
 
		if($this->validation->run() == FALSE)			
		{
                        // gagal login dan kembali ke form login
			$data=$this->home_model->form_login();		
			$this->load->view('login',$data);
		}
		else 
		{		
                        // berhasil login			
			$data=$this->home_model->halaman_admin();		
			$this->load->view('halaman_admin',$data);
		}	
	}else			
	{	
                // tampilkan form login
		$data=$this->home_model->form_login();		
		$this->load->view('login',$data);
	}
}

function login_check()
{		
	$usrid	= $this->db->escape_str($this->input->post("username"));
	$passwd =md5($this->input->post("password"));
	$query	= $this->db->query("select * from usr where login='$usrid' and passwd='$passwd'");
	$count		= $query->num_rows();
	if($count>0)
	{
		foreach($query->result() as $row)
		{
			if($row->disabled=='TRUE')
			{
				$this->validation->set_message('login_check', 'Silahkan aktifasi dahulu !');
				return FALSE;
			}else{
				$this->session->set_userdata('usrid',$row->usrid);		
				return TRUE;
			}
		}
	}else{
		$this->validation->set_message('login_check', 'Access denied');
		return FALSE;
	}
}