login_header( string|null $title = null, string $message = '', WP_Error|null $wp_error = null )

41function login_header( $title = null, $message = '', $wp_error = null ) {42	global $error, $interim_login, $action;43 44	if ( null === $title ) {45		$title = __( 'Log In' );46	}47 48	// Don't index any of these forms.49	add_filter( 'wp_robots', 'wp_robots_sensitive_page' );50	add_action( 'login_head', 'wp_strict_cross_origin_referrer' );51 52	add_action( 'login_head', 'wp_login_viewport_meta' );53 54	if ( ! is_wp_error( $wp_error ) ) {55		$wp_error = new WP_Error();56	}57 58	// Shake it!59	$shake_error_codes = array( 'empty_password', 'empty_email', 'invalid_email', 'invalidcombo', 'empty_username', 'invalid_username', 'incorrect_password', 'retrieve_password_email_failure' );60	/**61	 * Filters the error codes array for shaking the login form.62	 *63	 * @since 3.0.064	 *65	 * @param string[] $shake_error_codes Error codes that shake the login form.66	 */67	$shake_error_codes = apply_filters( 'shake_error_codes', $shake_error_codes );68 69	if ( $shake_error_codes && $wp_error->has_errors() && in_array( $wp_error->get_error_code(), $shake_error_codes, true ) ) {70		add_action( 'login_footer', 'wp_shake_js', 12 );71	}72 73	$login_title = get_bloginfo( 'name', 'display' );74 75	/* translators: Login screen title. 1: Login screen name, 2: Network or site name. */76	$login_title = sprintf( __( '%1$s &lsaquo; %2$s &#8212; WordPress' ), $title, $login_title );77 78	if ( wp_is_recovery_mode() ) {79		/* translators: %s: Login screen title. */80		$login_title = sprintf( __( 'Recovery Mode &#8212; %s' ), $login_title );81	}82 83	/**84	 * Filters the title tag content for login page.85	 *86	 * @since 4.9.087	 *88	 * @param string $login_title The page title, with extra context added.89	 * @param string $title       The original page title.90	 */91	$login_title = apply_filters( 'login_title', $login_title, $title );92 93	?><!DOCTYPE html>94	<html <?php language_attributes(); ?>>95	<head>96	<meta http-equiv="Content-Type" content="<?php bloginfo( 'html_type' ); ?>; charset=<?php bloginfo( 'charset' ); ?>" />97	<title><?php echo $login_title; ?></title>98	<?php99 100	wp_enqueue_style( 'login' );101 102	/*103	 * Remove all stored post data on logging out.104	 * This could be added by add_action('login_head'...) like wp_shake_js(),105	 * but maybe better if it's not removable by plugins.106	 */107	if ( 'loggedout' === $wp_error->get_error_code() ) {108		ob_start();109		?>110		<script>if("sessionStorage" in window){try{for(var key in sessionStorage){if(key.indexOf("wp-autosave-")!=-1){sessionStorage.removeItem(key)}}}catch(e){}};</script>111		<?php112		wp_print_inline_script_tag( wp_remove_surrounding_empty_script_tags( ob_get_clean() ) );113	}114 115	/**116	 * Enqueues scripts and styles for the login page.117	 *118	 * @since 3.1.0119	 */120	do_action( 'login_enqueue_scripts' );