Base::searchItemSelectedQuantityRangeHash

protected function searchItemSelectedQuantityRangeHash($id)
{
	if (empty($this->quantityRanges[$id]))
		return null;
	foreach ($this->quantityRanges[$id] as $range)
	{
		if ($this->checkQuantityRange($range))
			return $range['HASH'];
	}
	reset($this->quantityRanges[$id]);
	$firsrRange = current($this->quantityRanges[$id]);
	return $firsrRange['HASH'];
}