在 WP Admin 中显示紧急信息的方法，该代码将任何登录的用户显示定制的消息：
/**
* 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，为管理提醒函数增加钩子用来显示定制消息：
/**
* 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');