Here is the code we can use to display related posts.



<?php

//for use in the loop, list 5 post titles related to first tag on current post

$tags = wp_get_post_tags($post->ID);

if ($tags) {

  echo 'Related Posts';

  $first_tag = $tags[0] -> term_id;

  $args = array (

    'tag__in' => array($first_tag),

    'post__not_in' => array($post->ID),

    'showposts'=>5,

    'caller_get_posts'=>1

   );

  $my_query = new WP_Query($args);

  if( $my_query->have_posts() ) {

    while ($my_query->have_posts()) : $my_query->the_post(); 

?>

<p>

   <a href="<?php the_permalink() ?>" 
      rel="bookmark"
      title="Permanent Link to <?php the_title_attribute(); ?>">
      <?php the_title(); ?>
   </a>

</p>

<?php

    endwhile;
  
  }

}

?>

Source: https://wordpress.org/support/topic/passing-current-single_tag_title-as-variable-into-new-wp_query

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