So the WP codex says to query posts from different categories i use this:
I am doing that in this (http://pastebin.com/69WTBi8Q) script to display rss feed from various categories, but it's only showing the first category in the string. http://dev.liquor.com/custom-rss-feed/
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That code isn't outputting RSS, since you're sending the headers way too late.
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It's rendering as text/html, not application/xml.
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You can query posts telling it to make a feed:.
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To fix the category problem, try doing this:.
query_posts(array( 'cat' => '2,6,17,38', 'feed' => 'rss2' ));
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You need to hook this onto a hook any time after 'init' but no later than 'wp_loaded'..
query_posts(array( 'category__in' => array(2,6,17,38), 'feed' => 'rss2' ));
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