我尝试写接口文档调用，但是报错

$class->get('sysinfo','Network.Info')
//报错
{"ACTION":"sysinfo","CODE":"MissingNonce","MESSAGE":"Missing nonce!"}

下面是核心代码

public function get($appName, $actonName){
        $options = $this->options($appName, $actonName);
        $request = $this->client->request('GET','/?api_action='.$appName,[
            'timeout'=>10,
            'verify'=>false,
            'query'=>$options
        ]);
        $body = false;
        try{
            if($request->getStatusCode() == 200){
                $body = $request->getBody();
            }else{
                $this->error = $request->getStatusCode();
            }
        }catch (RequestException $exception){
            $this->error = $exception->getMessage();
        }
        return $body;
    }

    private function options($appName, $actonName){
        $time = time();
        $options = [
            'api_action'=>$actonName,//API 接口名称
            'api_agent_app'=>$appName,//受控端应用代号
            'api_format'=>'json',
            'api_lang'=>'zh_cn',
            'api_timestamp'=>$time,
            'api_nonce'=>substr(md5($time),6,16),//随机字符
            'api_debug'=>$this->isDubug
        ];
        $options['api_sign'] = $this->sign($options);

    }

    private function sign($options)
    {
        $data = [];
        ksort($options);
        foreach ($options as $_k=>$_v){
            if (is_array($_v)){
                asort($_v);
            }
            $data[$_k] = $_v;
        }
        $query = http_build_query($data);
        return hash_hmac('md5', $query, $this->signKey);
    }