SubtopicsList::ProcessParameters PHP Method

    protected function ProcessParameters(array $p_parameters)
    {
        $parameters = array();
        foreach ($p_parameters as $parameter => $value) {
            $parameter = strtolower($parameter);
            switch ($parameter) {
                case 'length':
                case 'columns':
                case 'name':
                case 'order':
                    if ($parameter == 'length' || $parameter == 'columns') {
                        $intValue = (int) $value;
                        if ("{$intValue}" != $value || $intValue < 0) {
                            CampTemplate::singleton()->trigger_error("invalid value {$value} of parameter {$parameter} in statement list_subtopics");
                        }
                        $parameters[$parameter] = (int) $value;
                    } else {
                        $parameters[$parameter] = $value;
                    }
                    break;
                case 'direct':
                    $parameters[$parameter] = filter_var($value, FILTER_VALIDATE_BOOLEAN);
                    break;
                default:
                    CampTemplate::singleton()->trigger_error("invalid parameter {$parameter} in list_subtopics", $p_smarty);
            }
        }
        // 'topic_identifier' and 'language_id' parameters are needed for the cache key
        $context = CampTemplate::singleton()->context();
        $parameters['topic_identifier'] = $context->topic->identifier;
        if (is_null($parameters['topic_identifier'])) {
            $parameters['topic_identifier'] = 0;
        }
        $parameters['language_id'] = $context->language->number;
        return $parameters;
    }