Scalr\Service\CloudStack\Client\QueryClient::call PHP Method

    public function call($command, array $args = null, $verb = 'GET')
    {
        $attempts = 3;
        if ($args === null) {
            $args = array();
        }
        foreach ($args as $key => $value) {
            if (is_null($value)) {
                unset($args[$key]);
            }
            // Workaround for zones.
            if ($key == 'zoneid' && !is_null($value)) {
                if (empty($this->zonesCache)) {
                    foreach ($this->cloudstack->zone->describe() as $zone) {
                        $this->zonesCache[$zone->name] = $zone->id;
                    }
                }
                if (!empty($this->zonesCache[$value])) {
                    $args[$key] = $this->zonesCache[$value];
                } else {
                    throw new RestClientException("Availability zone '{$value}' no longer supported");
                }
            }
        }
        $args['apikey'] = $this->apiKey;
        $args['command'] = $command;
        $args['response'] = 'json';
        ksort($args);
        $query = http_build_query($args, null, '&', PHP_QUERY_RFC3986);
        if ('GET' == $verb) {
            $query .= "&signature=" . $this->getSignature(strtolower($query));
        } else {
            $args['signature'] = $this->getSignature(strtolower($query));
        }
        $httpRequest = new Request();
        $httpRequest->setRequestMethod($verb);
        $url = 'GET' == $verb ? $this->endpoint . "?" . $query : $this->endpoint;
        $httpRequest->setRequestUrl($url);
        if ('POST' == $verb) {
            $httpRequest->append($args);
        }
        $message = $this->tryCall($httpRequest, $attempts);
        $response = new QueryClientResponse($message, $command);
        $response->setRawRequestMessage($httpRequest->toString());
        if ($this->debug) {
            echo "\nURL: " . $httpRequest->getRequestUrl() . "\n", "{$httpRequest}\n", "{$response->getResponse()}\n";
        }
        return $response;
    }