//获取签名包
public function getSignPackage() {
    $jsapiTicket = $this->getJsApiTicket();
    $url = "http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
    $timestamp = time();
    $nonceStr = $this->createNonceStr();
    
    // 这里参数的顺序要按照 key 值 ASCII 码升序排序
    $tmpArr = array(
            ‘noncestr‘ => $nonceStr,
            ‘timestamp‘ => $timestamp,
            ‘jsapi_ticket‘ => $jsapiTicket,
            ‘url‘ => $url
    );
    
    ksort($tmpArr, SORT_STRING);
    $string1 = http_build_query( $tmpArr );
    $string1 = urldecode( $string1 );
    $signature = sha1( $string1 );
    
    $signPackage = array(
            "appId"     => $this->appid,
            "nonceStr"  => $nonceStr,
            "timestamp" => $timestamp,
            "url"       => $url,
            "signature" => $signature,
            "rawString" => $string1
    );
    return $signPackage;
}


//获取jsapi_ticket
private function getJsApiTicket() {
   if (S(‘jsapi_ticket_‘.$this->appid)) {
      $ticket = S(‘jsapi_ticket_‘.$this->appid);
   } else {
      $accessToken   =  $this->getToken($this->appid, $this->appsecret);
      $url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$accessToken";
      $res = $this->request_get($url);
      $ticket = $res[‘ticket‘];
      if ($ticket) {
         S(‘jsapi_ticket_‘.$this->appid, $ticket, 7200);
      }
   }
   return $ticket;
}

/**
 * @param $appid
 * @param $appsecret
 * @return mixed
 * 获取token
 */
public function getToken($appid, $appsecret){
   if (S($appid)) {
      $access_token = S($appid);
   } else {
      $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" . $appid . "&secret=" . $appsecret;
      $json  =  file_get_contents($url);
      $result    =  json_decode($json);
      $access_token  =  $result->access_token;
      S($appid, $access_token, 7200);
   }
   return $access_token;
}

/**
* 发送get请求
* @param string $url
* @return bool|mixed
*/
function request_get($url = ‘‘){
  if (empty($url)) {
     return false;
  }
  $json  =  file_get_contents($url);
  $result    =  json_decode($json,true);
  return $result;
}

public function createNonceStr($length = 16) {
   $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
   $str = "";
   for ($i = 0; $i < $length; $i++) {
      $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
   }
   return $str;
}

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