To expand on my comment above, you would replace your code with something like this:
print_taxonomy_ranks( get_the_terms( $post->ID, 'post_tags' ) );
and in your function print_taxonomy_ranks
you’d replace the echo statement with your preferred output.
function print_taxonomy_ranks( $terms ) {
// if terms is not array or its empty don't proceed
if ( ! is_array( $terms ) || empty( $terms ) ) {
return false;
}
foreach ( $terms as $term ) {
// if the term have a parent, set the child term as attribute in parent term
if ( $term->parent != 0 ) {
$terms[$term->parent]->child = $term;
} else {
// record the parent term
$parent = $term;
}
}
echo "Order: $parent->name, Family: {$parent->child->name}, Sub-Family: {$parent->child->child->name}";
}
Extracted from this answer
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