我找到了罪魁祸首函数add_theme_page(). 那里

有一个附加参数，根据the codex for add_theme_page() 需要移除的。移除这些似乎有帮助。

function fivehundred_register_admin_menu() {
  add_theme_page(
    \'500 Settings\',
    \'500 Settings\',
    \'manage_options\',
    \'theme-settings\',
    \'fivehundred_admin_menu\',
    plugins_url( \'/ignitiondeck/images/ignitiondeck-menu.png\' )
  );
}

add_action(
  \'admin_menu\',
  \'fivehundred_register_admin_menu\'
);

function fivehundred_register_admin_menu() {
  add_theme_page(
    \'500 Settings\',
    \'500 Settings\',
    \'manage_options\',
    \'theme-settings\',
    \'fivehundred_admin_menu\'
  );
}

add_action(
  \'admin_menu\',
  \'fivehundred_register_admin_menu\'
);

您可以通过将第七个参数添加为null.

function fivehundred_register_admin_menu() {
  add_theme_page(
    \'500 Settings\',
    \'500 Settings\',
    \'manage_options\',
    \'theme-settings\',
    \'fivehundred_admin_menu\',
    plugins_url( \'/ignitiondeck/images/ignitiondeck-menu.png\' ),
    null
  );
}

add_action(
  \'admin_menu\',
  \'fivehundred_register_admin_menu\'
);

同样的错误也适用于add\\u pages\\u page（）函数中的参数问题

对于其他未使用add\\u theme\\u page（）或add\\u submenu\\u page（）函数的用户，请查找您对add\\u pages\\u page（）的使用情况并更正参数。

在我的例子中，我需要删除第一个为null的参数，并给页面一个标题。

此通知可由函数的多个变体/包装触发add_submenu_page.

自WP v5.8起

添加插件页面添加用户页面添加评论页面添加管理页面添加选项页面u theme\\u page为了缩小范围，寻找合适的函数，我们可以修改核心文件./wp-admin/includes/plugin.php （约1420行）更详细。

_doing_it_wrong(
  __FUNCTION__,
  sprintf(
    /* translators: %s: add_submenu_page() */
    __( \'The seventh parameter passed to %s should be an integer representing menu position. %s\' ),
    \'<code>add_submenu_page()</code>\',
    print_r( $new_sub_menu, true )
  ),
  \'5.3.0\'
);

add_dashboard_page(
  \'Link Builder\',
  \'Link Builder\',
  \'manage_options\',
  \'mytheme-woocommerce-helper\',
  array( $this, \'mytheme_woocommerce_helper_create_admin_page\' ),
  \'dashicons-admin-generic\',
  2
);

PHP Notice:  add_submenu_page was called <strong>incorrectly</strong>. 
The seventh parameter passed to <code>add_submenu_page()</code> 
should be an integer representing menu position.  
Please see <a href="https://wordpress.org/support/article/debugging-in-wordpress/">Debugging in WordPress</a> for more information. 
(This message was added in version 5.3.0.) in wp-includes/functions.php on line 5535

PHP Notice:  add_submenu_page was called <strong>incorrectly</strong>. 
The seventh parameter passed to <code>add_submenu_page()</code> 
should be an integer representing menu position.  
Array
(
   [0] => Link Builder
   [1] => manage_options
   [2] => mytheme-woocommerce-helper
   [3] => Link Builder
)

warning/disclaimer/notes