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Show related post without a plugin

If you want to show related post in you current post , you can use simple way to show. You just need to copy and paste under following codes into single.php file of your theme. This code will display related posts based on the current post tag(s). It must be pasted within the loop.

<?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 : How to: Show related posts without a plugin

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