输出登录页面标题。

原型

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

参数

$title (string) (Optional)  WordPress登录页面标题显示在元素中。

$message (string) (Optional)  要在标题中显示的消息。

$wp_error (WP_Error) (Optional)  传递的错误。默认是WP_Error实例。

源文件

路径：wp-login.php

<?php
...
function login_header( $title = 'Log In', $message = '', $wp_error = null ) {
	global $error, $interim_login, $action;
	// Don't index any of these forms
	add_action( 'login_head', 'wp_no_robots' );
	add_action( 'login_head', 'wp_login_viewport_meta' );
	if ( ! is_wp_error( $wp_error ) ) {
		$wp_error = new WP_Error();
	}
	// Shake it!
	$shake_error_codes = array( 'empty_password', 'empty_email', 'invalid_email', 'invalidcombo', 'empty_username', 'invalid_username', 'incorrect_password' );
	/**
	 * Filters the error codes array for shaking the login form.
	 *
	 * @since 3.0.0
	 *
	 * @param array $shake_error_codes Error codes that shake the login form.
	 */
	$shake_error_codes = apply_filters( 'shake_error_codes', $shake_error_codes );
	if ( $shake_error_codes && $wp_error->get_error_code() && in_array( $wp_error->get_error_code(), $shake_error_codes ) )
		add_action( 'login_head', 'wp_shake_js', 12 );
	$login_title = get_bloginfo( 'name', 'display' );
	/* translators: Login screen title. 1: Login screen name, 2: Network or site name */
	$login_title = sprintf( __( '%1$s &lsaquo; %2$s &#8212; WordPress' ), $title, $login_title );
	/**
	 * Filters the title tag content for login page.
	 *
	 * @since 4.9.0
	 *
	 * @param string $login_title The page title, with extra context added.
	 * @param string $title       The original page title.
	 */
	$login_title = apply_filters( 'login_title', $login_title, $title );
	?><!DOCTYPE html>
	<!--[if IE 8]>
		<html ;
	if ( $interim_login ) {
		$classes[] = 'interim-login';
		?>
		<style type="text/css">html{background-color: transparent;}</style>
		<?php
		if ( 'success' ===  $interim_login )
			$classes[] = 'interim-login-success';
	}
	$classes[] =' locale-' . sanitize_html_class( strtolower( str_replace( '_', '-', get_locale() ) ) );
	/**
	 * Filters the login page body classes.
	 *
	 * @since 3.5.0
	 *
	 * @param array  $classes An array of body classes.
	 * @param string $action  The action that brought the visitor to the login page.
	 */
	$classes = apply_filters( 'login_body_class', $classes, $action );
	?>
	</head>
	<body class="login <?php echo esc_attr( implode( ' ', $classes ) ); ?>">
	<?php
	/**
	 * Fires in the login page header after the body tag is opened.
	 *
	 * @since 4.6.0
	 */
	do_action( 'login_header' );
	?>
	<div id="login">
		<h1><a href="<?php echo esc_url( $login_header_url ); ?>" title="<?php echo esc_attr( $login_header_title ); ?>" tabindex="-1"><?php echo $login_header_text; ?></a></h1>
	<?php
	unset( $login_header_url, $login_header_title );
	/**
	 * Filters the message to display above the login form.
	 *
	 * @since 2.1.0
	 *
	 * @param string $message Login message text.
	 */
	$message = apply_filters( 'login_message', $message );
	if ( !empty( $message ) )
		echo $message . "n";
	// In case a plugin uses $error rather than the $wp_errors object
	if ( !empty( $error ) ) {
		$wp_error->add('error', $error);
		unset($error);
	}
	if ( $wp_error->get_error_code() ) {
		$errors = '';
		$messages = '';
		foreach ( $wp_error->get_error_codes() as $code ) {
			$severity = $wp_error->get_error_data( $code );
			foreach ( $wp_error->get_error_messages( $code ) as $error_message ) {
				if ( 'message' == $severity )
					$messages .= '	' . $error_message . "<br />n";
				else
					$errors .= '	' . $error_message . "<br />n";
			}
		}
		if ( ! empty( $errors ) ) {
			/**
			 * Filters the error messages displayed above the login form.
			 *
			 * @since 2.1.0
			 *
			 * @param string $errors Login error message.
			 */
			echo '<div id="login_error">' . apply_filters( 'login_errors', $errors ) . "</div>n";
		}
		if ( ! empty( $messages ) ) {
			/**
			 * Filters instructional messages displayed above the login form.
			 *
			 * @since 2.5.0
			 *
			 * @param string $messages Login messages.
			 */
			echo '<p class="message">' . apply_filters( 'login_messages', $messages ) . "</p>n";
		}
	}
} // End of login_header()
...
?>

其他

英文文档：https://developer.wordpress.org/reference/functions/login_header/