How to understand if an admin is logged in as user?

[Remitur]

Question: how is it possible, in a hook such as i.e. ClientAreaPage, understand if a user is logged in as himself, or if it's an administrator logged in as user?

In .tpl it's easy, because we have two variables to check ( $adminMasqueradingAsClient and $adminLoggedIn) to check, but in PHP area?

Real case: I'm working on this hook, which should force the user to a certain language, bound to the domain he's visiting, so, for english for example.com, french for example.fr, italian for example.it etc.

It works, but I need to find a way to disable it if the logged-in user is an admin-logged-in-as-user: for some kind of unknown reason, it broke the magic of the function "login as user", and the admin so is redirected to ordinary login page.

<?php

add_hook('ClientAreaPage', 1, switch_languagehost($vars));

function switch_languagehost($vars) {

    $client= Menu::context('client');
    if (is_null($client))
    {
        $domain=$_SERVER['SERVER_NAME'];
        $language='english';
        
        if ($domain=='example.fr' )
        {
            $language='french';
        }
        
        if(!isset($_SESSION['switch-language']) && $_SESSION['uid'] == false ) 
            {
                $_SESSION['switch-language'] = true; // prevent from redirecting back again in this session
            }
        
        if(!isset($_SESSION['Language']) || $_SESSION['Language'] != $language) {
               $location = '?language='.$language;
               if($_SERVER['QUERY_STRING'] != '' && strpos($_SERVER['QUERY_STRING'],'?language')===0) 
                        $location .= '&'.$_SERVER['QUERY_STRING'];
                ob_clean();
                header('location: '.$location);
                die();
           }
    }
}

?>

Any idea?  

[brian!]

10 minutes ago, Remitur said:

Any idea?  

if you're checking session values in the hook, you could see if 'adminid has been set... if so, they're an admin.

[Remitur]

27 minutes ago, brian! said:

if you're checking session values in the hook, you could see if 'adminid has been set... if so, they're an admin.

It works, thanks!

Just changing from:

 if (is_null($client))

to 

 if (is_null($client) AND is_null($_SESSION['adminid']))