function related_posts_shortcode( $atts ) {
 
	extract(shortcode_atts(array(
	    'limit' => '5',
	), $atts));
 
	global $wpdb, $post, $table_prefix;
 
	if ($post->ID) {
 
		$retval = '
<ul>';
 
		// Get tags
		$tags = wp_get_post_tags($post->ID);
		$tagsarray = array();
		foreach ($tags as $tag) {
			$tagsarray[] = $tag->term_id;
		}
		$tagslist = implode(',', $tagsarray);
 
		// Do the query
		$q = "
			SELECT p.*, count(tr.object_id) as count
			FROM $wpdb->term_taxonomy AS tt, $wpdb->term_relationships AS tr, $wpdb->posts AS p
			WHERE tt.taxonomy ='post_tag'
				AND tt.term_taxonomy_id = tr.term_taxonomy_id
				AND tr.object_id  = p.ID
				AND tt.term_id IN ($tagslist)
				AND p.ID != $post->ID
				AND p.post_status = 'publish'
				AND p.post_date_gmt < NOW()
			GROUP BY tr.object_id
			ORDER BY count DESC, p.post_date_gmt DESC
			LIMIT $limit;";
 
		$related = $wpdb->get_results($q);
 
		if ( $related ) {
			foreach($related as $r) {
				$retval .= '
	<li><a title="'.wptexturize($r->post_title).'" href="'.get_permalink($r->ID).'">'.wptexturize($r->post_title).'</a></li>
';
			}
		} else {
			$retval .= '
	<li>No related posts found</li>
';
		}
		$retval .= '</ul>
';
		return $retval;
	}
	return;
}
add_shortcode('related_posts', 'related_posts_shortcode');

Wordpress Related Posts Shortcode

wordpress

PHP