作为一个例外，如果用户到达需要登录的点，我希望重定向到登录屏幕，并且一旦他登录并且证书条件已满（设置为myappname_allow_redirect) 我想重定向回用户所在的最后一个url

在一些要求用户登录的短代码中：

try{

  $mus = new myappnameUserService();
}catch (myappnameNeedsLoginException $e){
  global $wp;
 //this is the easiest way supposedly to get the current URL see here https://wordpress.stackexchange.com/questions/274569/how-to-get-url-of-current-page-displayed
  $thisUrl = home_url($wp->request);
  $thisUrl =  urlencode($thisUrl);
  myappname_redirect_to_url(\'/wp-login.php?redirect_to=\' . $thisUrl . \'&myappname_allow_redirect=1\');
}

功能。php

    function myappname_login_redirect($redirect_to, $request, $user)
    {

      if ($user instanceof WP_User) {
        if (isset($user->roles) && is_array($user->roles)) {
          //check for admins
          if (in_array(\'administrator\', $user->roles)) {
            // redirect them to the default place
            return $redirect_to;
          } else {
            //if something is set her for exceptions, we allow regular redirect as well
            if($_GET[\'myappname_allow_redirect\']){
                return $redirect_to;
            }else{
//but normally we redirect to a standard url
                return \'somethingelse\';
            }
          }
        } else {
          return $redirect_to;
        }
      }
      //is there a user to check?

    }

    add_filter(\'login_redirect\', \'myappname_login_redirect\', 10, 3);

首先，它似乎起作用了，我被重定向到mydomain。com/wp登录。php？将\\u重定向到=xxxx（&U）；myappname\\u allow\\u redirect=1

但是

myappname_login_redirect($redirect_to, $request, $user)

$redirect_to 是空的，也是空的$request

   function myappname_login_redirect($redirect_to, $request, $user)
    {

      if ($user instanceof WP_User) {
        if (isset($user->roles) && is_array($user->roles)) {
          //check for admins
          if (in_array(\'administrator\', $user->roles)) {
            // redirect them to the default place
            return $redirect_to;
          } else {
            //if something is set her for exceptions, we allow regular redirect as well
            if($_GET[\'myappname_allow_redirect\']){
                return $redirect_to;
            }else{
//but normally we redirect to a standard url
                return \'somethingelse\';
            }
          }
        } else {
          return $redirect_to;
        }
      }
      //is there a user to check?

return $redirect_to;
    }

    add_filter(\'login_redirect\', \'myappname_login_redirect\', 10, 3);