public function filter_dropdown() {

		// Get which forum is selected
		$selected = ! empty( $_GET['bbp_forum_id'] )
			? (int) $_GET['bbp_forum_id']
			: 0;

		// Show the forums dropdown
		bbp_dropdown( array(
			'selected'  => $selected,
			'show_none' => esc_html__( 'In all forums', 'bbpress' )
		) );
	}