WP_Customize_Manager::get_return_url(): string

4718	public function get_return_url() {4719		global $_registered_pages;4720 4721		$referer                    = wp_get_referer();4722		$excluded_referer_basenames = array( 'customize.php', 'wp-login.php' );4723 4724		if ( $this->return_url ) {4725			$return_url = $this->return_url;4726 4727			$return_url_basename = wp_basename( parse_url( $this->return_url, PHP_URL_PATH ) );4728			$return_url_query    = parse_url( $this->return_url, PHP_URL_QUERY );4729 4730			if ( 'themes.php' === $return_url_basename && $return_url_query ) {4731				parse_str( $return_url_query, $query_vars );4732 4733				/*4734				 * If the return URL is a page added by a theme to the Appearance menu via add_submenu_page(),4735				 * verify that it belongs to the active theme, otherwise fall back to the Themes screen.4736				 */4737				if ( isset( $query_vars['page'] ) && ! isset( $_registered_pages[ "appearance_page_{$query_vars['page']}" ] ) ) {4738					$return_url = admin_url( 'themes.php' );4739				}4740			}4741		} elseif ( $referer && ! in_array( wp_basename( parse_url( $referer, PHP_URL_PATH ) ), $excluded_referer_basenames, true ) ) {4742			$return_url = $referer;4743		} elseif ( $this->preview_url ) {4744			$return_url = $this->preview_url;4745		} else {4746			$return_url = home_url( '/' );4747		}4748 4749		return $return_url;4750	}