How to return newly added terms when using wp_set_object_terms

Question

I am using wp_set_object_terms to add terms (attributes) to our WooCommerce products:

wp_set_object_terms($id, array($migrate_case), 'pa_case');

This gives us the advantage (instead of using wp_set_post_terms) that non-existing terms are created automatically.

Is there any way to get wp_set_object_terms() to tell me if it had to create a new term?

Thanks in advance for any help.

Answer 1

You can add a filter for a specific function call like so:

add_filter( 'set_object_terms', 'checkNewTerm', 10, 6 );

function checkNewTerm( $object_id, $terms, $tt_ids, $taxonomy, $append, $old_tt_ids ) {

    // Do stuff, ie. compare count of $tt_ids and $old_tt_ids
}

wp_set_object_terms($id, array($migrate_case), 'pa_case');

remove_filter( 'set_object_terms', 'checkNewTerm', 10, 6 );