When a reader finished reading one of your blog posts, why not suggesting him other article he might like as well? Here’s a quick tip to automatically display related posts (based on category) below the current post.

First, paste the code below into the functions.php file from your theme.

 // "More from This Category" list by Barış Ünver @ Wptuts+ function wptuts_more_from_cat( $title = "More From This Category:" ) {     global $post;     // We should get the first category of the post     $categories = get_the_category( $post->ID );     $first_cat = $categories[0]->cat_ID;     // Let's start the $output by displaying the title and opening the <ul>     $output = '<div id="more-from-cat"><h3>' . $title . '</h3>';     // The arguments of the post list!     $args = array(         // It should be in the first category of our post:         'category__in' => array( $first_cat ),         // Our post should NOT be in the list:         'post__not_in' => array( $post->ID ),         // ...And it should fetch 5 posts - you can change this number if you like:         'posts_per_page' => 5     );     // The get_posts() function     $posts = get_posts( $args );     if( $posts ) {         $output .= '<ul>';         // Let's start the loop!         foreach( $posts as $post ) {             setup_postdata( $post );             $post_title = get_the_title();             $permalink = get_permalink();             $output .= '<li><a href="' . $permalink . '" title="' . esc_attr( $post_title ) . '">' . $post_title . '</a></li>';         }         $output .= '</ul>';     } else {         // If there are no posts, we should return something, too!         $output .= '<p>Sorry, this category has just one post and you just read it!</p>';     }     // Let's close the <div> and return the $output:     $output .= '</div>';     return $output; } 

Once done, open your single.php file and call the function as shown below, where you’d like to display the related posts:

 <?php echo wptuts_more_from_cat( 'More From This Category:' ); ?> 

Thanks to WP Tuts for the cool tip!