Get related posts in Wordpress

gistfile1.aw

function get_related_posts($options = array("numberposts" => 4)) {
        global $post;

		$defaults = array(
			"post__not_in" => array($post->ID)
		);
			
		$args = array_merge($options, $defaults);
        $tags = wp_get_post_tags($post->ID);
		$cats = wp_get_post_terms($post->ID, "category", array("fields" => "ids"));

		function getID($tag){
			return $tag->term_id;
		}
		
		$args['tax_query'] = array(
			'relation' => 'OR',
			array(
				"taxonomy" => "category",
				"field" => "id",
				"terms" => $cats
			),
			array(
				"taxonomy" => "post_tag",
				"field" => "id",
				"terms" => array_map("getID", $tags)
			)
		);
		

		return get_posts($args);
}