原型

_wp_admin_html_begin()

源文件

路径:wp-admin/includes/template.php

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<?php
...
function _wp_admin_html_begin() {
	global $is_IE;

	$admin_html_class = ( is_admin_bar_showing() ) ? 'wp-toolbar' : '';

	if ( $is_IE )
		@header('X-UA-Compatible: IE=edge');

?>
<!DOCTYPE html>
<!--[if IE 8]>
<html xmlns="http://www.w3.org/1999/xhtml" class="ie8 <?php echo $admin_html_class; ?>" <?php
	/**
	 * Fires inside the HTML tag in the admin header.
	 *
	 * @since 2.2.0
	 */
	do_action( 'admin_xml_ns' );
?> <?php language_attributes(); ?>>
<![endif]-->
<!--[if !(IE 8) ]><!-->
<html xmlns="http://www.w3.org/1999/xhtml" class="<?php echo $admin_html_class; ?>" <?php
	/** This action is documented in wp-admin/includes/template.php */
	do_action( 'admin_xml_ns' );
?> <?php language_attributes(); ?>>
<!--<![endif]-->
<head>
<meta http-equiv="Content-Type" content="<?php bloginfo('html_type'); ?>; charset=<?php echo get_option('blog_charset'); ?>" />
<?php
}

...
?>

其他

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