RSS Feed/News Need to detect node or page

[ENXF NET]

I've been using this code for a long time now and it works great:
Code:

$fileDir = '/path/to/public_html';

require($fileDir.'/src/XF.php' );
\XF::start($fileDir);

$app = \XF::setupApp('XF\Pub\App');
$app->start();

$visitor = \XF::visitor();

$user_id = $visitor['user_id'];

When I have my own custom page I use this code to fetch the $user_id but is there a way to check if the page itself is a node or a page? Because if it's a node then it fails because of this code:

Code:

$fileDir =...

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