How to mark every 3rd post
My approach. No extra function, no filter. 🙂 <?php $GLOBALS[‘wpdb’]->current_post = 0; ?> <div <?php post_class( 0 === ++$GLOBALS[‘wpdb’]->current_post % 3 ? ‘third’ : ” ); ?>> Alternative: <div <?php post_class( 0 === ++$GLOBALS[‘wpdb’]->wpse_post_counter % 3 ? ‘third’ : ” ); ?>>