previous next button on posts
$prev_post = get_adjacent_post(false, '', true);
if(!empty($prev_post)) {
echo '<a href="' . get_permalink($prev_post->ID) . '" title="' . $prev_post->post_title . '">' . $prev_post->post_title . '</a>'; }
---------------------------------------
$next_post = get_adjacent_post(false, '', false);
if(!empty($next_post)) {
echo '<a href="' . get_permalink($next_post->ID) . '" title="' . $next_post->post_title . '">' . $next_post->post_title . '</a>'; }
----------------------------------------------
<div class="links-next-before">
<?php
$prev_post = get_adjacent_post(false, '', true);
if(!empty($prev_post)) { ?>
<div class="left">
<button type="button" class="btn btn-blue">
<?php echo '<a href="' . get_permalink($prev_post->ID) . '" title="' . $prev_post->post_title . '">' . $prev_post->post_title . '</a>'; ?>
</button>
<?php } ?>
</div>
<?php $next_post = get_adjacent_post(false, '', false);
if(!empty($next_post)) { ?>
<div class="right">
<button type="button" class="btn btn-blue">
<?php echo '<a href="' . get_permalink($next_post->ID) . '" title="' . $next_post->post_title . '">' . $next_post->post_title . '</a>'; ?>
</button>
</div>
<?php } ?>
</div>