expire_time < time() || !$data->expire_time) {            $appid = appid;            $appsecret = appsecret;            $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$appid&secret=$appsecret";            $res = json_decode(file_get_contents($url));            $access_token = $res->access_token;            if($access_token) {                $data_new['expire_time'] = time() + 7000;                $data_new['access_token'] = $access_token;                file_put_contents($tokenFile, json_encode($data_new));            }        }else{            $access_token = $data->access_token;        }        return $access_token;    }    // var_dump(getAccessToken());?>

亲测可用，也许会遇到读写权限问题。