/**
 * [getAccessToken description] 获取access_token
 * @return [type] [description] */private function getAccessToken() {
  $data = $this->getFile($this->accessTokenFile);  if(time() - $data['time'] > 0){
    $url = "https://api.weixin.qq.com/cgi-bin/token";
    $re = $this->httpGet($url);
    $access_token = $re['access_token'];    
    if(isset($access_token)){
      $data['access_token'] = $access_token;
      $data['time'] = time() + 7200;
      $this->setFile($this->accessTokenFile,json_encode($data));
    }
  }else{
    $access_token = $data['access_token'];
  }  return $access_token;
}

/**
 * [getJsapiTicket description] 获取jsapi_ticket
 * @return [type] [description] */private function getJsapiTicket() {
  $access_token = $this->getAccessToken();
  $jsapi_ticket = $this->getFile($this->jsapiTicketFile);  if(time() - $jsapi_ticket['time'] > 0) {
    $url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket";
    $re = $this->httpGet($url);
    $this->preArr($re);
    $jsapi_ticket = $re['ticket'];    
    if(isset($jsapi_ticket)){
      $data['jsapi_ticket'] = $jsapi_ticket;
      $data['time'] = time() + 7200;
      $this->setFile($this->jsapiTicketFile, json_encode($data));
    }
  }else{
    $jsapi_ticket = $jsapi_ticket['jsapi_ticket'];
  }  return $jsapi_ticket;
}

/**
 * [getSignpackage description] 获取签名
 * @return [type] [description] */public function getSignpackage(){
  $jsapi_ticket = $this->getJsapiTicket();  // 注意 URL 一定要动态获取，不能 hardcode.
  $protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) "https://" : "http://";
  $url = "$protocol$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
  $noncestr = $this->createNonceStr();
  $timestamp = time();

  $string1 = "jsapi_ticket={$jsapi_ticket}&noncestr={$noncestr}&timestamp={$timestamp}&url={$url}";
  $signature = sha1($string1);  
  $signPackage = array(    
    'appId'   => $this->appID,    
    'nonceStr' => $noncestr,    
    'timestamp' => $timestamp,    
    'signature' => $signature,
  );  
  return $signPackage;
}