# Exclude posts without category from loop

I'm trying to exclude all the posts that doesn't have a category assigned to from the main loop, i searched everywhere and i found a billion ways to exclude some categories or filter from specific category but not what i need to do, is it possibile?

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Hi @Raffaele:

The function wp_get_object_terms(...) can provide you with the information you need. I've written a has_category($post_id) function that can be used in the loop like this: <?php while ( have_posts() ) : the_post(); ?> <?php if (has_category($post->ID)): ?>
<p><?php the_title(); ?></p>
<?php endif; ?>
<?php endwhile; ?>


And here is the has_category() function:

<?php
function has_category($post_id) {$has_category = false;
$terms = wp_get_object_terms($post_id,'category');
if (is_array($terms)) { foreach($terms as $index =>$term)
if ($term->slug=='uncategorized') unset($terms[$index]);$has_category = (count($terms)>0); } return$has_category;
}


Note that my has_category() function treats posts with the 'uncategorized' category as having no category. There are probably more performant ways to accomplish this but what you see above should work.

-Mike

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What about query_posts with category__in? –  t31os Feb 10 '11 at 16:39
@t31os - Probably. There are many roads that lead to Rome, this was just the one I chose to write about. :) –  MikeSchinkel Feb 10 '11 at 22:51
thanks for the quick response, it worked great! –  user3075 Feb 11 '11 at 15:13
The downside to this method is that you don't always have the same number of posts per page. When you ignore a post you don't add an extra one at the end of the page. –  Jan Fabry Feb 11 '11 at 15:28
@Jan Fabry - True. –  MikeSchinkel Feb 11 '11 at 15:39