请问为什么我用JSSDK做微信分享每点击个四五次以后就会报错呢？

Question

<?php
/**
 * Created by PhpStorm.
 * User: Artist
 * Date: 2017/11/6
 * Time: 10:24
 */

namespace APP\Common;


class JSSDK
{
    private $appId;
    private $appSecret;

    public function __construct($appId, $appSecret) {
        $this->appId = $appId;
        $this->appSecret = $appSecret;
    }

    public function getSignPackage() {
        $jsapiTicket = $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]";

        $timestamp = time();
        $nonceStr = $this->createNonceStr();

        // 这里参数的顺序要按照 key 值 ASCII 码升序排序
        $string = "jsapi_ticket=$jsapiTicket&noncestr=$nonceStr&timestamp=$timestamp&url=$url";

        $signature = sha1($string);

        $signPackage = array(
            "appId"     => $this->appId,
            "nonceStr"  => $nonceStr,
            "timestamp" => $timestamp,
            "url"       => $url,
            "signature" => $signature,
            "rawString" => $string
        );
        return $signPackage;
    }

    private 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;
    }

    private function getJsApiTicket() {

        $accessToken = $this->getAccessToken();

        // 如果是企业号用以下 URL 获取 ticket
        // $url = "https://qyapi.weixin.qq.com/cgi-bin/get_jsapi_ticket?access_token=$accessToken";
        $url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$accessToken";
        $res = json_decode($this->httpGet($url));

//下面一句是65行

        $ticket = $res->ticket;
        return $ticket;
    }

    private function getAccessToken() {
        $data = json_decode(file_get_contents(public_path("access_token.json")));//建立一个文件把第一次请求到的token对象放进去
        if (empty($data) || $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;
            $expires_in = $res->expires_in;
            if ( $access_token ) {
                $data->expire_time = time() + ($expires_in - 100);
                $data->access_token = $access_token;
                $fp = fopen(public_path("access_token.json"), "w");
                fwrite($fp, json_encode($data));
                fclose($fp);
            }
        } else {
            $access_token = $data->access_token;
        }

        return $access_token;
    }

    private function httpGet($url) {
        $curl = curl_init();
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($curl, CURLOPT_TIMEOUT, 500);
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
        curl_setopt($curl, CURLOPT_URL, $url);

        $res = curl_exec($curl);
        curl_close($curl);

        return $res;
    }
}

64行$res正确时内容

64行$res错误时内容

我的access_token.json文件是放在public下面的，里面是有内容写入的。
使用个四五次以后就会报错。
请大佬教我。

Answer 1

把64行那个$res打出来, 看内容.

Answer 2

access_token失效了,应该是你别的地方调用了access_token,而文件没有更新?