微信公众平台开发自动更新微信access token

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我是靠谱客的博主大胆蓝天，最近开发中收集的这篇文章主要介绍微信公众平台开发自动更新微信access token，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

本文介绍如何存储及更新 access token的方法。

一、Access Token

access_token是公众号的全局唯一票据，公众号调用各接口时都需使用access_token。正常情况下access_token有效期为7200秒，重复获取将导致上次获取的access_token失效。

公众号可以使用AppID和AppSecret调用本接口来获取access_token。AppID和AppSecret可在开发模式中获得（需要已经成为开发者，且帐号没有异常状态）。注意调用所有微信接口时均需使用https协议。

接口调用请求说明

http请求方式: GET
https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=APPSECRET
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参数说明

参数	是否必须	说明
grant_type	是	获取access_token填写client_credential
appid	是	第三方用户唯一凭证
secret	是	第三方用户唯一凭证密钥，既appsecret

返回说明

正常情况下，微信会返回下述JSON数据包给公众号：

{"access_token":"ACCESS_TOKEN","expires_in":7200}
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三、实现

class class_weixin
{
    var $appid = APPID;
    var $appsecret = APPSECRET;

    //构造函数，获取Access Token
    public function __construct($appid = NULL, $appsecret = NULL)
    {
        if($appid && $appsecret){
            $this->appid = $appid;
            $this->appsecret = $appsecret;
        }

        //1. 数据库形式
        /*
        DROP TABLE IF EXISTS `wx_token`;
        CREATE TABLE IF NOT EXISTS `wx_token` (
          `id` int(1) NOT NULL,
          `type` varchar(20) NOT NULL,
          `expire` varchar(16) NOT NULL,
          `value` varchar(600) NOT NULL,
          PRIMARY KEY (`id`)
        ) ENGINE=MyISAM DEFAULT CHARSET=utf8;

        INSERT INTO `wx_token` (`id`, `type`, `expire`, `value`) VALUES
        (1, 'access_token', '1425534992', 't3oyW9fRnOWKQHQhZXoEH-pgThhjmnCqTVpaLyUD'),
        (2, 'jsapi_ticket', '', '');
        */
        $con = mysql_connect(MYSQLHOST.':'.MYSQLPORT, MYSQLUSER, MYSQLPASSWORD);
        mysql_select_db(MYSQLDATABASE, $con);
        $result = mysql_query("SELECT * FROM `wx_token` WHERE `type` = 'access_token'");
        while($row = mysql_fetch_array($result))
        {
            $this->access_token = $row['value'];
            $this->expires_time = $row['expire'];
            break;
        }
        if (time() > ($this->expires_time + 3600)){
            $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=".$this->appid."&secret=".$this->appsecret;
            $res = $this->http_request($url);
            $result = json_decode($res, true);
            $this->access_token = $result["access_token"];
            $this->expires_time = time();
            mysql_query("UPDATE `wx_token` SET `expire` = '$this->expires_time', `value` = '$this->access_token' WHERE `type` = 'access_token';");
        }

        //2. 缓存形式
        if (isset($_SERVER['HTTP_APPNAME'])){        //SAE环境，需要开通memcache
            $mem = memcache_init();
        }else {                                        //本地环境，需已安装memcache
            $mem = new Memcache;
            $mem->connect('localhost', 11211) or die ("Could not connect");
        }
        $this->access_token = $mem->get($this->appid);
        if (!isset($this->access_token) || empty($this->access_token)){
            $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=".$this->appid."&secret=".$this->appsecret;
            $res = $this->http_request($url);
            $result = json_decode($res, true);
            $this->access_token = $result["access_token"];
            $mem->set($this->appid, $this->access_token, 0, 3600);
        }

        //3. 本地写入
        $res = file_get_contents('access_token.json');
        $result = json_decode($res, true);
        $this->expires_time = $result["expires_time"];
        $this->access_token = $result["access_token"];

        if (time() > ($this->expires_time + 3600)){
            $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=".$this->appid."&secret=".$this->appsecret;
            $res = $this->http_request($url);
            $result = json_decode($res, true);
            $this->access_token = $result["access_token"];
            $this->expires_time = time();
            file_put_contents('access_token.json', '{"access_token": "'.$this->access_token.'", "expires_time": '.$this->expires_time.'}');
        }

        //4. 实时拉取
        $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=".$this->appid."&secret=".$this->appsecret;
        $res = $this->http_request($url);
        $result = json_decode($res, true);
        $this->access_token = $result["access_token"];
        $this->expires_time = time();
    }
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