要查看的文件：wp-admin/includes/wp-current-screen.php 和wp-admin/admin-header.php

如果我们看看admin-header.php 我们可以看到$current_screen->render_screen_meta(); 负责在屏幕上呈现上下文帮助。它得到了全球$current_screen 通过以下方式设置WP_Screen 班

它有如下方法get_help_tabs,get_help_tab,add_help_tab,remove_help_tab,remove_help_tabs , set_help_sidebar 设置和删除我们看到的选项卡。检查以下代码以获取示例。

/* 
We can hook into admin_head-{$page_hook}. admin_head fires after the 
default contextual help tabs have been added.
*/
add_action(\'admin_head-index.php\', \'wpse_226724_add_help_tab\');
function wpse_226724_add_help_tab () {

    $screen = get_current_screen();

    //checking whether we are on dashboard main page or not
    if ( $screen->id != \'dashboard\' )
        return;

    //You can remove all default tabs using this
    //$screen->remove_help_tabs();

    //Adding tab with an id overview it gets replaced if tab is already available with same id
    $screen->add_help_tab( array(
        \'id\' => \'overview\',
        \'title\' => __(\'WPSE\'),
        \'content\' => \'<p>\'
        . __( \'Welcome to the WPSE community. Get a taste of WordPress!\', \'text_domain\' )
        . \'</p>\',
    ) );
}

概述

帮助导航

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和一个侧边栏帮助