This feature comes with version 1.30.2 and is still experimental.
In some cases you may want to modify the term query so that it returns only tags that belong to certain tag groups. You can use the filter tag_groups_modify_term_query_args to modify the array of arguments that you pass to WP_Term_Query (or get_terms).
It accepts up to three arguments:
- The array of arguments that you will use for the term query. The element with the key “meta_query” will be overwritten.
- An array or a comma-separated list of group IDs.
- The logical relation between the group IDs (default: OR), alternatively AND.
In the following example you show only tags that belong to the groups with the IDs 1 or 5:
// define your query parameters as usual $args = array( 'taxonomy' => 'post_tag' ); // apply the filter on them, with additional filter parameters $args = apply_filters( 'tag_groups_modify_term_query_args', $args, array(1,5), 'OR'); // use the resulting arguments in your query $tags = get_terms( $args );