title: Query multiple categories in WordPress
body: <p>The WP codex says to query posts from different categories I use this:</p>
  
  <pre><code>query_posts('cat=2,6,17,38'); 
  </code></pre>
  
  <p>I am doing that in this (<a href="http://pastebin.com/69WTBi8Q" rel="nofollow noreferrer">http://pastebin.com/69WTBi8Q</a>) script to display rss feed from various categories, but it's only showing the first category in the string. <a href="http://dev.liquor.com/custom-rss-feed/" rel="nofollow noreferrer">http://dev.liquor.com/custom-rss-feed/</a></p>
  
  <p>Why?</p>