CEventCalendar::CheckMR

function CheckMR($Params)
{
	global $USER, $DB;

	if (!$Params['allowResMeeting'])
		return false;

	if ($Params['regularity'] == "NONE")
	{
		$fromDateTime = MakeTimeStamp($Params['dateFrom']);
		$toDateTime = MakeTimeStamp($Params['dateTo']);

		$arFilter = array(
			"ACTIVE" => "Y",
			"IBLOCK_ID" => $Params['RMiblockId'],
			"SECTION_ID" => $Params['mrid'],
			" date(getDateFormat(), $toDateTime),
			">DATE_ACTIVE_TO" => date(getDateFormat(), $fromDateTime),
			"PROPERTY_PERIOD_TYPE" => "NONE",
		);

		if ($Params['mrevid_old'] > 0)
			$arFilter["!=ID"] = $Params['mrevid_old'];

		$dbElements = CIBlockElement::GetList(array("DATE_ACTIVE_FROM" => "ASC"), $arFilter, false, false, array('ID'));
		if ($arElements = $dbElements->GetNext())
			return 'reserved';

		include_once($_SERVER['DOCUMENT_ROOT']."/bitrix/components/bitrix/intranet.reserve_meeting/init.php");
		$arPeriodicElements = __IRM_SearchPeriodic($fromDateTime, $toDateTime, $Params['RMiblockId'], $Params['mrid']);

		for ($i = 0, $l = count($arPeriodicElements); $i < $l; $i++)
			if (!$Params['mrevid_old'] || $arPeriodicElements[$i]['ID'] != $Params['mrevid_old'])
				return 'reserved';
	}
	return true;
}