// Related Post
function get_related_posts($post_id, $tags = array()) {
$query = new WP_Query();
$post_types = get_post_types();
unset($post_types['page'], $post_types['attachment'], $post_types['revision'], $post_types['nav_menu_item']);
if($tags) {
foreach($tags as $tag) {
$tagsA[] = $tag->term_id;
}
}
$query = new WP_Query( array('showposts' => 4,'post_type' => $post_types,'post__not_in' => array($post_id),'tag__in' => $tagsA,'ignore_sticky_posts' => 1,
));
return $query;
}