title: Wordpress: Disable Tags only for Posts
body: <p>I am currently developing a theme for Wordpress 3.8.1. As my theme will not display any tags, so I want do disable them (only from the posts, not from custom post types). But how do I do this? I have tried this, but apparently, it does nothing:</p>
  
  <pre><code>register_taxonomy('post_tag', null);
  </code></pre>
  
  <p>To be clear: I do not just want to hide the tags in the template files, but I want to disable them completely, so in the backend, there is no menu item for tags under posts.</p>
  
  <p>Is it even possible? I hope so. Thanks for your help!</p>
  
  <h2>Update</h2>
  
  <p>Additionally, I have tried the following, without any effect:</p>
  
  <pre><code>register_taxonomy('post_tag', array());
  </code></pre>
  
  <p>and</p>
  
  <pre><code>global $wp_taxonomies;
  $taxonomy = 'post_tag';
  if(taxonomy_exists($taxonomy))
      unset($wp_taxonomies[$taxonomy]);
  </code></pre>
  
  <p>Both remove the tags box while editing a post, but there still is the link in the menu pointing to the list of tags!</p>