PHPStorm and php IDEs

Let's take codeigniter for example... is there a way to define or tell the editor what models/controllers/helpers i am using? so i have autocomplete for stuff like $this->session->set_userdata('logged', 1); - i do not have autocomplete on that issue, and would be a great deal to have it. It is the best thing about phpstorm, and the second one is reformat code. It's made just the way i code.