self::set_transient_message( $message ) ], $url ); } wp_safe_redirect( $url ); exit; } /** * Get a message set during the previous redirect. * * @param string $query_var Optional namespace for the message. * * @return string|null Message content if there is one. */ public static function get_message( $query_var = '' ) { if ( empty( $query_var ) ) { $query_var = self::DEFAULT_QUERY_VAR; } //phpcs:ignore WordPress.Security.NonceVerification.Recommended -- No action is performed. $key = sanitize_key( wp_unslash( $_GET[ $query_var ] ?? null ) ); if ( ! $key ) { return null; } $content = self::get_transient_message( $key ); if ( ! $content ) { return null; } $content .= self::add_inline_script( $query_var ); UI::ensure_styles(); return $content; } /** * Add a message for the next page load. * * @param string $message Message to be displayed on the next page load. * * @return string Transient key. */ private static function set_transient_message( $message ) { $key = uniqid(); set_transient( self::TRANSIENT_PREFIX . $key, $message, 10 * MINUTE_IN_SECONDS ); return $key; } /** * Get a message for the given transient key, and optionally delete the transient. * * @param string $key Transient key. * @param bool $delete Whether to delete the message after retrieving it. * * @return string|null Message to be displayed on the next page load. */ private static function get_transient_message( $key, $delete = true ) { $content = get_transient( self::TRANSIENT_PREFIX . $key ); if ( ! is_string( $content ) ) { return null; } if ( $delete ) { delete_transient( self::TRANSIENT_PREFIX . $key ); } return $content; } /** * Add a small script to remove the redirect message query var from the URL upon page load. * * @param string $query_var Query var to remove. * * @return string Script HTML. */ private static function add_inline_script( $query_var ) { $query_var = esc_js( $query_var ); return << const url = new URL( location.href ); url.searchParams.delete('{$query_var}'); history.replaceState(null, '', url) HTML; } }