joshmeney

add_filter( 'woocommerce_related_products_args', 'rare_related_products_by_custom_taxonomy');
function rare_related_products_by_custom_taxonomy( $args ) {

	global $post;

	$tags = wp_get_post_terms( $post->ID, "custom_taxonomy" );
	foreach ( $tags as $tag ) {
			$tags_array[] .= $tag->term_id;
	}