I needed to remove the bottom border of the last post in my Hellish Simplicity theme for WordPress. I couldn’t initially see an easy way to do this, but eventually figured out a simple way via analysing the post count in the $wp_query global variable.

Note: if you want to add odd and even classes to your post containers, check out this article by WPBeginner.com

You can add this functionality to your own themes, by copy and pasting the following snippet into your functions.php file.

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/**
 * Adds a class of .last-post to the last post in a loop.
 * 
 * @param   array   $classes   The array of post classes
 * @global  object  $wp_query  The main query object
 * @return  array   The array of post classes, with .last-post added
 */
function add_last_post_class( $classes ) {
	global $wp_query;

	if ($wp_query->current_post == ( $wp_query->post_count - 1 ) ) {
		$classes[] = 'last-post';
	}

	return $classes;
}
add_filter( 'post_class', 'add_last_post_class' );