Битрикс — скрипт деактивирования товаров, которых нет в наличии

$DOCUMENT_ROOT = $_SERVER["DOCUMENT_ROOT"];
if(empty($DOCUMENT_ROOT)){
	$DOCUMENT_ROOT = '/home/public_html';
}
require($DOCUMENT_ROOT."/bitrix/modules/main/include/prolog_before.php");
define("NO_KEEP_STATISTIC", true);
define("NOT_CHECK_PERMISSIONS", true);
ini_set('max_execution_time', '36000');
set_time_limit(0);
ini_set('memory_limit', '512M');
$IBLOCK_ID = 15;
$c = 0;
CModule::IncludeModule("iblock");
CModule::IncludeModule("catalog");
CModule::IncludeModule("sale");
$arFilter = Array(
   "IBLOCK_ID"=>$IBLOCK_ID,
   // "ID"=>123,//для отладки
   // "QUANTITY"=>"0",
   // "SECTION_ID"=>87,
   // "INCLUDE_SUBSECTIONS"=>"Y",
);
$res = CIBlockElement::GetList(Array("ID"=>"ASC"), $arFilter, false, false, Array("ID","NAME","IBLOCK_ID","CODE","QUANTITY","CATALOG_AVAILABLE","ACTIVE"));
while ($ar_fields = $res->GetNext()){
	$ID_ITEM = $ar_fields["ID"];
	// echo $ar_fields["ID"]." - ".$ar_fields["CATALOG_AVAILABLE"]." - ".$ar_fields["ACTIVE"].'
';
	if($ar_fields["CATALOG_AVAILABLE"] == "N"){
		$arFields = array(
			'ID' => $ID_ITEM,
			'ACTIVE' => "N",
		);
	}
	else{
		$arFields = array(
			'ID' => $ID_ITEM,
			'ACTIVE' => "Y",
		);
	}
	$obE = new CIBlockElement();
	if ($obE->Update($ID_ITEM, $arFields)){
		$c++;
	}
}
echo 'fin: '.$c;