<?phpfunction getAccessToken($appid,$appsecret) {    $mem = new CacheMemcache();    $acc = $mem->get(‘access_token_‘.$appid);    if (!$acc)     {        $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$appid&secret=$appsecret";        $result = https_request($url);        $jsoninfo = json_decode($result, true);        $access_token = $jsoninfo[‘access_token‘];        if ($access_token)         {            $expire = time() + 7000;            $mem = new CacheMemcache();            $mem->set(‘access_token_‘.$appid,$access_token,$expire);        }    }    else     {        $access_token = $acc;    }    return $access_token;}?>

 function getAccessToken() {    // access_token 应该全局存储与更新，以下代码以写入到文件中做示例    $data = json_decode(file_get_contents("access_token.json"));    if ($data->expire_time < time()) {      $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$this->appId&secret=$this->appSecret";      $res = json_decode($this->httpGet($url));      $access_token = $res->access_token;      if ($access_token) {        $data->expire_time = time() + 7000;        $data->access_token = $access_token;        $fp = fopen("access_token.json", "w");        fwrite($fp, json_encode($data));        fclose($fp);      }    } else {      $access_token = $data->access_token;    }    return $access_token;  }