RestService::getOrder

static function getOrder($rules, $fields, array $default = array())
{
	$order = array();
	if (!empty($rules) && is_array($rules))
	{
		foreach ($rules as $field => $ordering)
		{
			$field = mb_strtoupper($field);
			$ordering = mb_strtoupper($ordering);
			if (isset($fields[$field]))
				$order[$fields[$field]] = $ordering == 'DESC' ? 'DESC' : 'ASC';
		}
	}

	return $order ? $order : $default;
}