Update post terms

Question

The function wp_set_post_terms() works fantastically however I'm looking to add some terms to a post at a later date. I've tried using wp_set_post_terms() and wp_set_object_terms() but they just overwrite what's already there. I thought wp_add_object_terms() was the answer to my question but it has the same functionality whereby overwriting the original terms.

Any way to append terms via code?

Answer 1

However, wp_set_object_terms(); seems made for your case:

From WordPress Codex:

Relates an object (post, link etc) to a term and taxonomy type (tag, category, etc). Creates the term and taxonomy relationship if it doesn't already exist.

<?php wp_set_object_terms( $object_id, $terms, $taxonomy, $append ); ?>

The clue

$append parameter is bool: if true, tags will be appended to the object. If false, tags will replace existing tags

Hope it helps!