Catalog::encodeProductLog

static function encodeProductLog(array $log)
{
	$value = array();

	foreach ($log as $itemId => $recommendation)
	{
		$rcmId = $recommendation[0];
		$rcmTime = $recommendation[1];

		$value[] = $itemId.'-'.$rcmId.'-'.$rcmTime;
	}

	return join('.', $value);
}