Programmatically Add Tag to Wordpress Post Without Overwriting Pre-Existing Tags

Question

I am able to add a tag to my post in code, but it overwrites the existing array of tags. Does anyone know of a way to add a tag to the array of pre-existing tags so that none are erased?

wp_set_object_terms($post_id, 'mytagname', 'post_tag');

This part of the Wordpress API seems a bit clunky, but maybe I'm completely missing something. Any help would be appreciated!

Turns out RTFM was the answer.

Answer 1

Look at the fourth parameter of the function - $append . If it is set to true , the tags are appended to the existing tags, if it's false (the default) they replace them.

So you want to call it like so:

wp_set_object_terms($post_id, 'mytagname', 'post_tag', true);