<?php $single = (is_single() ? TRUE : FALSE); if ($single){ $prevPost = get_previous_post(); if (!empty( $prevPost )){ ?> <link rel="prev" href="<?php echo get_permalink($prevPost->ID); ?>"/> <?php } $nextPost = get_next_post(); if (!empty( $nextPost )) { ?> <link rel="next" href="<?php echo get_permalink($nextPost->ID); ?>"/> <?php } } ?>