title: Filter a Drupal view (displayed in a panel) by taxonomy term depending on domain
body: <p>This is a Views 6.x-2.x problem: On a site with many different views (many of which are blocks included in Panels that pass arguments to blocks) I would like to filter views by a taxonomy term depending on the domain the site is visited through. This filtering should be additional to a first argument (taxonomy term).</p>
  
  <p>The site is configured to work with different domains, let's say example1.com and example2.com. I want to "connect" those domains to the taxonomy terms 45 and 115.</p>
  
  <p>So for example:</p>
  
  <p>example1.com/my_view/1
  Should show all nodes that have term 1 and term 45.</p>
  
  <p>example2.com/my_view/1
  Should show all nodes that have term 1 and term 115.</p>
  
  <p>My approach was to add a second argument (the first is the default taxonomy term ID argument). As default argument I use the following snipped in the argument handling code:</p>
  
  <pre><code>&lt;?php
  // Get domain.
  $host = preg_match('/[^.]+\.[^.]+$/', $_SERVER['HTTP_HOST'], $hit);
  $host = $hit[0];
  
  // Select taxonomy term.
  if ($host == 'example1.com'){
    $taxonomy = '45';
  } elseif ($host == 'example2.com'){
    $taxonomy = '115';
  }
  
  return $taxonomy;
  ?&gt;
  </code></pre>
  
  <p>This works when I use a page display with the path my_view/% (making only the first argument mandatory). But when I use it in a panel, I just get an empty view (if "no context" is chosen) or the second argument doesn't have any effect (if "term id of first/all term" is chosen).</p>
  
  <p>Any ideas what could be wrong? I have really tried a lot.</p>