/**
 * 屏蔽后台页脚版本号
 */
function change_footer_admin () {return '';}
add_filter('admin_footer_text', 'change_footer_admin', 9999);
function change_footer_version() {return '';}
add_filter( 'update_footer', 'change_footer_version', 9999);

/**
 * 屏蔽后台导航栏LOGO
 */
function annointed_admin_bar_remove() {
        global $wp_admin_bar;
        /* Remove their stuff */
        $wp_admin_bar->remove_menu('wp-logo');
}
add_action('wp_before_admin_bar_render', 'annointed_admin_bar_remove', 0);