菜单栏全部由an object 实例化为$wp_admin_bar.

我想这就是你想要的：

function remove_page_menu_wpse_104826() {
  global $wp_admin_bar;
  // var_dump($wp_admin_bar); // debug; uncomment and look at the bottom of the page for the big mess
  $wp_admin_bar->remove_menu(\'new-page\');
}
add_action(\'wp_before_admin_bar_render\', \'remove_page_menu_wpse_104826\', 1);