当用户的帐户升级到新的用户角色时，我使用这段代码向用户发送确认电子邮件。
function user_role_update( $user_id, $new_role ) {
$site_url = get_bloginfo(\'wpurl\');
$user_info = get_userdata( $user_id );
$to = $user_info->user_email;
$subject = "Role changed: ".$site_url."";
$message = "Hello " .$user_info->display_name . " your role has changed on ".$site_url.", congratulations you are now an " . $new_role;
wp_mail($to, $subject, $message);
}
add_action( \'set_user_role\', \'user_role_update\', 10, 2);
无论账户是升级还是降级，这都会发送一封电子邮件，这并不能让我灵活地发送不同的降级消息。我有两种情况使用这个。
当用户从“贡献者”升级到“作者”时如何使用条件为每个事件发送不同的电子邮件？
最合适的回答,由SO网友:Adam 整理而成
很可能像这样的事情会起作用；
function user_role_update( $user_id, $new_role ) {
$site_url = get_bloginfo(\'wpurl\');
$user_info = get_userdata( $user_id );
if (user_can( $user_id, \'capability\' ) ) {
$to = $user_info->user_email;
$subject = "Role changed: ".$site_url."";
$message = "Hello " .$user_info->display_name . " your role has changed on ".$site_url.", congratulations you are now an " . $new_role;
wp_mail($to, $subject, $message);
} elseif (user_can( $user_id, \'capability\' ) ) {
// etc...
}
}
add_action( \'set_user_role\', \'user_role_update\', 10, 2);
