Returning individual columns from a custom object

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I'm trying to follow the section titled "Returning individual columns from a custom object" of this guide:

 http://documentation.custhelp.com/euf/assets/devdocs/august2015/Connect_PHP/Default.htm

I have a custom object which looks like this:

I realise I can probably easily get the ID by adjusting the query but I'd rather try and fetch the ID from the results of the existing query as per the documented example.

$roql_result_set = RNCPHP\ROQL::query("SELECT * FROM CSSUser.CSSProfile WHERE CSSUser.CSSProfile.UserID = $userID")->next();
    $id = 0;
        echo("<script>console.log('$id');</script>");
        while ($roql = $roql_result_set->next()){
            $id = $roql->ID;
            echo("<script>console.log('Test');</script>");
            echo("<script>console.log('$roql->ID');</script>");
            echo("<script>console.log('$id');</script>");
        }