Add Previous Next button to WordPress single page article

Considering the internal link of WordPress SEO, Lao Zuo (laozuo. org) needs to have an internal link in each article. For example, we need to add the link export of the previous article and the next article in each article.

First, we declare the variables of the previous page and the next page:

 <?php $previous = get_previous_post(); $next = get_next_post(); ?>

Then, add the following code snippets in the single.php file of the topic to display them in the article:

 <?php if ( get_previous_post() ) {?> <a href="<?php echo get_the_permalink($previous) ?>"> <img src="<?php echo get_the_post_thumbnail_url($previous) ?>" alt=""> <div> <h3> <? php echo get_the_title($previous) ?></ h3> <p> PREV</p> </div> </a> <?php }?> <?php if ( get_next_post() ) {?> <a href="<?php echo get_the_permalink($next) ?>"> <img src="<?php echo get_the_post_thumbnail_url($next) ?>" alt=""> <div> <h3> <? php echo get_the_title($next) ?></ h3> <p>Next</p> </div> </a> <?php }?>