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CModule::IncludeModule('iblock');
$parentDepartmentId = '126'; //ИД подразделения, внутри которого ищем
$IBLOCK_ID = '5'; //ИД инфоблока подразделений
$arParenFilter = Array('IBLOCK_ID'=>$IBLOCK_ID, 'GLOBAL_ACTIVE'=>'Y', 'ID' => $parentDepartmentId);
$arParentSelect = Array('ID', 'IBLOCK_ID', 'LEFT_MARGIN', 'RIGHT_MARGIN', 'NAME');
$arChildSelect = Array('ID', 'IBLOCK_ID', 'LEFT_MARGIN', 'RIGHT_MARGIN', 'NAME');
$parentSection = CIBlockSection::GetList(Array($by=>$order), $arParenFilter, false, $arParentSelect);
if($arParentSection = $parentSection->GetNext()){
   $arChildFilter = array('IBLOCK_ID' => $arParentSection['IBLOCK_ID'],'>LEFT_MARGIN' => $arParentSection['LEFT_MARGIN'],'<RIGHT_MARGIN' => $arParentSection['RIGHT_MARGIN'],'>DEPTH_LEVEL' => $arParentSection['DEPTH_LEVEL']); // выберет потомков без учета активности
   $childSection = CIBlockSection::GetList(array('left_margin' => 'asc'), $arChildFilter, false, $arChildSelect);
   while ($arChildSection = $childSection->GetNext())
   {
      $arChildIDs[] = $arChildSection['ID'];
   }
}
 

AddEventHandler('ldap', 'OnLdapUserFields', 'myUserDesactivate');
function myUserDesactivate($arParams)
{
$arFilter = Array(); //ваши параметры для фильтрации юзеров. у меня и ИДшники были, и логины
$arSelect = Array("FIELDS"=>Array("ID", "LOGIN", "LAST_NAME", "NAME"));
$rsUsers = CUser::GetList(($by="id"), ($order="desc"), $arFilter, $arSelect);
while($arUsers=$rsUsers->GetNext()){
   $userDeactiveId[]=$arUsers["ID"];
}
foreach($userDeactiveId as $userID){
$user = new CUser;
$fields = Array("ACTIVE"=> "N");
$user->Update($userID, $fields);
$strError .= $user->LAST_ERROR;
unset($user);
}
}