CSS菜单图标/ Wordpress自定义菜单图标

function add_menu_icons_styles(){
?>
 
<style>
#adminmenu #menu-posts-mycustomposttype div.wp-menu-image:before {
  content: "\f338";
}
</style>
 
<?php
}
add_action( 'admin_head', 'add_menu_icons_styles' );