BBP_Topics_Widget::update( array $new_instance = array(), array $old_instance = array() )

	public function update( $new_instance = array(), $old_instance = array() ) {
		$instance                 = $old_instance;
		$instance['title']        = strip_tags( $new_instance['title'] );
		$instance['order_by']     = strip_tags( $new_instance['order_by'] );
		$instance['parent_forum'] = sanitize_text_field( $new_instance['parent_forum'] );
		$instance['max_shown']    = (int) $new_instance['max_shown'];

		// Date
		$instance['show_date'] = isset( $new_instance['show_date'] )
			? (bool) $new_instance['show_date']
			: false;

		// Author
		$instance['show_user'] = isset( $new_instance['show_user'] )
			? (bool) $new_instance['show_user']
			: false;

		// Force to any
		if ( !empty( $instance['parent_forum'] ) && !is_numeric( $instance['parent_forum'] ) ) {
			$instance['parent_forum'] = 'any';
		}

		return $instance;
	}