<?
	function get_related_posts($max_results = 4) {

		# Back up old $posts and $post variables, as get_posts will change those
		global $post, $posts;
		$post_backup = $post;
		$posts_backup = $posts;

		# Get terms from our custom taxonomy
		$terms = get_the_terms($post->ID , 'my-cusotm-taxonomy');
		
		# Create arrays to hold our already-added posts and the result of this function
		$do_not_duplicate[] = $post->ID;
		$total_matches = array();

		# Make sure there are any taxonomy terms we can loop through.
		if(!empty($terms) AND !is_wp_error($terms)) {
			
			# Loop over each term and do a new get_posts query for posts matching that term
			foreach ($terms as $term) {
				$posts = get_posts(array(
					'post_type' => 'news',
					'custom-tag' => $term->slug,
					'posts_per_page' => 4,
					'post__not_in' => $do_not_duplicate,
				));

				# If any posts are found by that query,
				# add them to $do_not_duplicate, so they won't be added again later,
				# then push them into our $total_matches array
				if($posts) {
					foreach ($posts as $post) {
						$do_not_duplicate[] = $post->ID;
						array_push($total_matches, $post);
					}
				}
			}

			# If we found any related posts above, show them.
			if (count($total_matches) > 0)
				$total_matches = array_slice($total_matches, 0, $max_results);
		}
				
		# Restore backups
		$post = $post_backup;
		$posts = $posts_backup;
		
		# Return result
		return $total_matches;
	}