static function get_all_terms()
{
if (!isset(Kanban_Terms::get_instance()->all_terms)) {
// get all terms for displaying
$args = array('hide_empty' => 0, 'orderby' => 'term_order');
$all_terms = get_terms(Kanban::get_instance()->taxonomies_list, $args);
Kanban_Terms::get_instance()->all_terms = Kanban_Utils::build_array_with_id_keys($all_terms, 'term_id');
}
return Kanban_Terms::get_instance()->all_terms;
}