QueryHelper::prepareOrder

static function prepareOrder(array $orderFields, array $fieldAlias = []): string
{
	$order = [];
	foreach ($orderFields as $field => $direction)
	{
		if (isset($fieldAlias[$field]))
		{
			$field = $fieldAlias[$field];
		}
		$order[] = "$field $direction";
	}
	$orderSql = '';
	if (count($order))
	{
		$orderSql = ' '. implode(', ', $order);
	}

	return $orderSql;
}