protected function sanitize_sort( $sort ) {

		$allowed_fields = $this->get_allowed_sort_fields();

		if ( empty( $allowed_fields ) ) {
			return $sort;
		}

		foreach ( (array) $sort as $orderby => $order ) {
			if ( ! in_array( $orderby, $allowed_fields, true ) || ! in_array( $order, array( 'ASC', 'DESC' ), true ) ) {
				unset( $sort[ $orderby ] );
			}
		}

		return $sort;

	}