Форум

$arIDS = [];

foreach($arItem["PROPERTIES"]["СВОЙСТВО-ЭЛЕМЕНТА-ИНФОБЛОКА"]["VALUE"] as $val) {
   $arIDS[] = $val;
}

$filter = [
   "ACTIVE"=>"Y",
   "ID"=>join(' | ', $arIDS)
];
$rsUsers = CUser::GetList(($by="id"), ($order="desc"), $filter);
while($res = $rsUsers->GetNext())
{
   echo "<pre>";
   print_r($res);
   echo "</pre>";
}

{

    /** echo "<pre>"; */
    /** print_r($res); */
    /** echo "</pre>"; */
    echo $res["ID"]. $res["NAME"]. $res["IS_ONLINE"]. "<br>";

}

{
    <p><? echo $arUser["PERSONAL_MAIL"];?></p>
    <p><? echo $arUser["PERSONAL_PHONE"];?></p>
}