wordpress: display current tag-id
<p>With</p>

<pre><code>$tag = single_tag_title('', false);
</code></pre>

<p>I can get the name of the currently chosen tag. Right?</p>

<p>But how can I get also the ID of the chosen tag? "single_tag_id" does not exist. And afterwards I would like to show only posts with the tag-id.</p>

<pre><code>$args = array(
            'tag' =&gt; 'ID HERE?',
        );
</code></pre>

<p>But I can not put a number into 'tag'. How can I filter with tag-id and not do it by name?</p>