Alas no answers or comments! 😛
Not to worry, a colleague helped me out here and here is the above code working with an $exclude
function terms_by_order($taxonomy, $exclude) {
global $post;
$terms = get_the_terms($post->ID, $taxonomy);
// check input
if ( empty($terms) || is_wp_error($terms) || !is_array($terms) ) return;
// exclude
foreach ($terms as $key=>$term) {
if (in_array($key, $exclude)) { // key in term_array is also term_id..
unset($terms[$key]);
break;
}
}
foreach ($terms as $key=>$term) {
$parent_term = $term; // gets last parent (should we get only the first one?)
if ($term->parent != 0) { // if there is a child, find it
$child_term = $term; // get the child term...
$parent_term = get_term_by('id', $term->parent, $taxonomy); // ... and the parent term
break;
}
}
if (isset($parent_term)) echo '<a href="'.get_term_link($parent_term, $taxonomy).'">'.$parent_term->name.'</a>';
if (isset($child_term)) echo ' / <a href="'.get_term_link($child_term, $taxonomy).'">'.$child_term->name.'</a>';
}