WrdPress如何在后台首页制作一个小部件（给客户的福利）

/**  1.站长工具小部件
 * 后台dashboard仪表盘中添加一个小部件
 *
 * This function is hooked into the 'wp_dashboard_setup' action below.
 */
function add_dashboard_widgets() {
	wp_add_dashboard_widget(
		'dashboard_widget', // Widget slug.
		'Site Manager', // Title.
		'dashboard_widget_function' // Display function.
	);
}
add_action( 'wp_dashboard_setup', 'add_dashboard_widgets' );
/**
 * 输出小部件
 */
function dashboard_widget_function() {
	echo '<div class"container">
	<ul><a href="https://analytics.google.com/analytics/web/" target="_blank">Google Analytics</a></ul>
	<ul><a href="https://search.google.com/search-console" target="_blank">Google Search Console</a></ul>
	<ul><a href="https://search.google.com/search-console/insights" target="_blank">Google Search Console Insights</a></ul>
	<ul><a href="https://www.bing.com/webmasters" target="_blank">Bing Webmaster</a></ul>
	<ul><a href="https://clarity.microsoft.com/projects" target="_blank">Bing Clarity</a></ul>
	<ul><a href="https://ziyuan.baidu.com/dashboard" target="_blank">百度站长工具</a></ul>
	<ul><a href="https://zhanzhang.sm.cn/open/detialPage" target="_blank">神马站长工具</a></ul>
	<ul><a href="https://zhanzhang.so.com/sitetool/site_manage" target="_blank">360站长工具</a></ul>
	<ul><a href="https://tool.chinaz.com/" target="_blank">站长工具</a></ul>
	<ul><a href="https://ip.tool.chinaz.com/" target="_blank">ip查询</a></ul>
	</div>';
}


//2.添加邮件管理小部件
add_action('wp_dashboard_setup', 'add_dashboard_widgets_email');
function add_dashboard_widgets_email(){
   global $wp_meta_boxes;
 
   wp_add_dashboard_widget( 'dashboard_email_widget', 'Email Manager', 'dashboard_widget_email');
}
function dashboard_widget_email() {
   echo '<div class"container">
	<ul><a href="https://mail.163.com/" target="_blank">163邮箱</a></ul>
	<ul><a href="https://exmail.qq.com/login" target="_blank">腾讯企业邮箱</a></ul>
	</div>';   
}

//3.添加服务器空间后台管理小部件
add_action('wp_dashboard_setup', 'add_dashboard_widgets_sever');
function add_dashboard_widgets_sever(){
   global $wp_meta_boxes;
 
   wp_add_dashboard_widget( 'dashboard_sever_widget', 'Sever Manager', 'dashboard_widget_sever');
}
function dashboard_widget_sever() {
   echo '<div class"container">
	<ul><a href="https://aliyun.com" target="_blank">阿里云</a></ul>
	<ul><a href="https://wanwang.aliyun.com/" target="_blank">万网域名</a></ul>
	</div>';   
}