Post status private on multiple forms

I know this can be done using gform_post_data, but the examples given suggest excluding all forms except the one specified. I assume this will also work by specifying ids to run the filter on by including ids, like so:

if($form["id"] = 2 || $form["id"] = 3 || $form["id"] = 4 ) {
$post_data["post_status"] = "private";
return $post_data;
    }
else {
return $post_data;
 }