在 WP Admin 中顯示緊急信息的方法，該代碼將任何登錄的用戶顯示定制的消息：
 

/**
 * Generic function to show a message to the user using WP's
 * standard CSS classes to make use of the already-defined
 * message colour scheme.
 *
 * @param $message The message you want to tell the user.
 * @param $errormsg If true, the message is an error, so use
 * the red message style. If false, the message is a status
  * message, so use the yellow information message style.
 */
function showMessage($message, $errormsg = false)
{
    if ($errormsg) {
        echo '<div id="message" class="error">';
    }
    else {
        echo '<div id="message" class="updated fade">';
    }

    echo "<p><strong>$message</strong></p></div>";
}

然后，為管理提醒函數增加鉤子用來顯示定制消息：

/**
 * Just show our message (with possible checking if we only want
 * to show message to certain users.
 */
function showAdminMessages()
{
    // Shows as an error message. You could add a link to the right page if you wanted.
    showMessage("You need to upgrade your database as soon as possible...", true);

    // Only show to admins
    if (user_can('manage_options') {
       showMessage("Hello admins!");
    }
}

/**
  * Call showAdminMessages() when showing other admin
  * messages. The message only gets shown in the admin
  * area, but not on the frontend of your WordPress site.
  */
add_action('admin_notices', 'showAdminMessages');