How to include within the Head in the Themes folder

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I have successfully been able to add a new line within the Head of a Theme in Packages; but I can't do the same with a Theme that I built myself and that only resides in the Application/Themes folder.
What I am trying to do: I want to add some extra PHP lines in an 'include' that can only sit within the "HTML' Head because it's a cookie consent script. Of course I can just add the stylesheet and the javascript directly in the head; but I want to centralize those lines in one single separate PHP file.

So I want to do something like this (see code block) - but strangely enough I get a PHP warning that tells me it's looking for the inlcude file in the 'concrete (!)' themes folder... the path is wrong; what to do...?

This is what my header.php file looks like (it's inside an Elements folder in the Theme in Application):

<!DOCTYPE html>
<html lang="nl" xml:lang="nl" xmlns="http://www.w3.org/1999/xhtml">
<head>
  <?php Loader::element('header_required') ?>
  <!-- start cookie consent -->
  <?php $this->inc('/elements/cookies/cookie-consent-html.php'); ?>
  <!-- end cookie consent -->
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="//fonts.googleapis.com/css?family=Roboto:100" rel="stylesheet">
  <link href="<?= $view->getThemePath() ?>/css/main.css" rel="stylesheet" type="text/css" />
</head>

jirosworld
 
hutman replied on at Permalink Reply
hutman
I think this should work if you remove the leading / in the path.