public static function set_theme() {

		$stylesheet = filter_input( INPUT_GET, 'theme' );
		$theme      = wp_get_theme( $stylesheet );

		if ( $theme->exists() && $theme->is_allowed() ) {
			setcookie( self::get_cookie_name(), $theme->get_stylesheet(), strtotime( '+1 year' ), COOKIEPATH );
		}

		wp_safe_redirect( wp_get_referer() );
		die;
	}