Related posts by searching post tags of single post as terms

Question

I want to have a related loop of posts on single post pages and to do this I want to search the tags of the post. My first question is can you use the search in query posts for multiple terms and what is correct way to do this. This is what I've been trying that is not working.

global $post;
$tags = wp_get_post_tags($post->ID);
$tag_ids = array();
foreach($tags as $individual_tag) $tag_ids[] = $individual_tag->term_id;
$args = array('cat' => '8', 'posts_per_page' => 8, 's' => $tag_ids,);
$my_search = new WP_Query($args);
if ($my_search->have_posts()) : while ($my_search->have_posts()) : $my_search-  >the_post(); ?>   

Answer 1

If you are inside the loop, on the single page, than you have all tags and can search for releated posts with the same tags. You find many solutions via google; an example:

//for use in the loop, list 5 post titles related to first tag on current post
$tags = wp_get_post_tags( get_the_ID() );
if ( $tags ) {

  echo 'Related Posts';

  $first_tag = $tags[0]->term_id;
  $args = array(
    'tag__in'          => array( $first_tag ),
    'post__not_in'     => array( get_the_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;
  }
}