get only the next and prev URL instead of full anchor. useful when you need extensive markup styling

next previous URLs wordpress

<?php 
  $prev = get_permalink(get_adjacent_post(false,'',false));
  $next = get_permalink(get_adjacent_post(false,'',true));
?>

<a href="<?php echo $prev; ?>">Previous Post</a> 
<a href="<?php echo $next; ?>">Next Post</a>

<?php //What if there isn’t a previous or next post? ?>

<php if ($prev != get_permalink()) : ?>
  <a href="<?php echo $prev; ?>">Previous Post Only Displaying If Available</a>
<?php endif ?>