session.php

См. документацию.

<?php
define("NO_KEEP_STATISTIC", true);
define("NOT_CHECK_FILE_PERMISSIONS", true);
 
require_once($_SERVER["DOCUMENT_ROOT"]."/bitrix/modules/main/include/prolog_before.php");
 
$status = "SESSION_EXPIRED";
 
if(check_bitrix_sessid())
{
    //still the same session
    $status = "OK";
}
elseif($USER->IsAuthorized())
{
    //the user got a new session, but has authorized by the stored cookie
    //change the sessid so the user can post a form successfully
    $request = \Bitrix\Main\Context::getCurrent()->getRequest();
 
    if($request->getCookie("UIDH") <> '')
    {
        $sessid = \Bitrix\Main\UI\SessionExpander::getSignedValue($request["k"]);
        if($sessid !== false)
        {
            bitrix_sessid_set($sessid);
            $status = "SESSION_CHANGED";
        }
    }
}
 
echo $status;
\Bitrix\Main\Application::getInstance()->end();