function is_login($level_name = FALSE) { $CI =& get_instance(); $user = new User($CI->session->userdata('id')); if ($level_name) { $level = new Level(); if ($user->level->level) { $id = $level->get_by_level($level_name)->id >= $user->level->id ? true : false; } else { $id = false; } } else { $id = $user->id; } return $id ? true : false; }