Greg Rickaby

If you’re rolling your own WordPress loop(s), then this trick comes in handy when you build a “grid loop”. A grid loop has post teasers side-by-side in a column.

<?php if (have_posts()) : while (have_posts()) : the_post();?>
   <div id="post-<?php the_ID(); ?>" <?php $even_odd = (++$j % 2 == 0) ? 'even-post' : 'odd-post'; post_class( $even_odd ); ?>
      <p><?php the_excerpt(); ?><>
   </div>
<?php endwhile; endif; ?>

Then in your CSS:

.odd-post {
	clear: both;
}