public function __construct()
{
$this->callbacks = [Request::TYPE_ADMIN => 'is_admin', Request::TYPE_FRONT_PAGE => 'is_front_page', Request::TYPE_POST_TYPE_ARCHIVE => 'is_post_type_archive', Request::TYPE_SEARCH => 'is_search', Request::TYPE_SINGULAR => [$this, 'is_singular'], Request::TYPE_TERM_ARCHIVE => [$this, 'is_term_archive']];
}