如果URL已知，用户仍然可以创建新帖子，如
domain.com/wp-admin/post-new.php

这是你可以使用的代码。。。已将其添加到文件中functions.php

function hide_add_new() {
global $submenu;
    // For Removing New Posts from Admin Menu
    unset($submenu[\'post-new.php?post_type=post\'][10]);
    // For Removing New Pages
    unset($submenu[\'post-new.php?post_type=page\'][10]);
   // For Removing CPTs
    unset($submenu[\'post-new.php?post_type=custom_post_type\'][10]);
}
add_action(\'admin_menu\', \'hide_add_new\');

//Thanks to Howdy_McGee
function remove_admin_bar_links() {
    global $wp_admin_bar;
    $wp_admin_bar->remove_menu(\'new-post\');
    $wp_admin_bar->remove_menu(\'new-page\');
    $wp_admin_bar->remove_menu(\'new-cpt\');
}
add_action( \'wp_before_admin_bar_render\', \'remove_admin_bar_links\' );


function disable_new_post() {
if ( get_current_screen()->post_type == \'my_post_type\' )
    wp_die( "You ain\'t allowed to do that!" );
}
add_action( \'load-post-new.php\', \'disable_new_post\' );

要删除子菜单，您可以检查您将看到的菜单li 将具有类似的IDwp-admin-bar-new-content 要删除所述菜单项，只需删除wp-admin-bar-. 这样我们就可以看到+New -> Post ID为的项目wp-admin-bar-new-post 所以我们可以这样删除它：

function remove_admin_bar_links() {
        global $wp_admin_bar;
        $wp_admin_bar->remove_menu(\'new-post\');
    }
    add_action( \'wp_before_admin_bar_render\', \'remove_admin_bar_links\' );

Reference Link / Tutorial

请尝试使用以下代码：

add_action( \'admin_bar_menu\', \'wpse126922_remove_newpost\', 999 );

function wpse126922_remove_newpost ( $wp_admin_bar ) {
    $wp_admin_bar->remove_node( \'new-post\' );
}