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<?php
\Bitrix\Main\Diag\Debug::writeToFile(
    var_export([
		'$arData' => $arData
	], true),
    date("Y-m-d H:i:s").PHP_EOL.__FILE__.':'.__LINE__,
    '_exch_'.date("Y-m-d").'.log'
);

\Bitrix\Main\Diag\Debug::dumpToFile($arResult);

\Bitrix\Main\Diag\Debug::startTimeLabel("catalogFilter"); 
#code
\Bitrix\Main\Diag\Debug::endTimeLabel("catalogFilter"); 
\Bitrix\Main\Diag\Debug::dumpToFile(\Bitrix\Main\Diag\Debug::getTimeLabels());