최상위 텀(term) 알아내기 (helper function)

최상위 텀(term)을 얻는 helper function. 자식 테마에 미리 정의해 놓고 사용

/**
 * Helper function to return the top most level term
 * @param  int $term_id
 * @param  string $taxonomy
 * @return stdClass Term object  
 */
function get_term_top_most_parent($term_id, $taxonomy){
    // start from the current term
    $parent  = get_term_by( 'id', $term_id, $taxonomy);
    // climb up the hierarchy until we reach a term with parent = '0'
    while ($parent->parent != '0'){
        $term_id = $parent->parent;

        $parent  = get_term_by( 'id', $term_id, $taxonomy);
    }
    return $parent;
}