微信公众平台开发自动更新微信access token

本文介绍如何存储及更新 access token的方法。

一、Access Tokenaccess_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: GEThttps://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=APPSECRET参数说明参数是否必须说明grant_type是获取access_token填写client_credentialappid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} 三、实现

class class_weixin{var $appid = APPID;var $appsecret = APPSECRET;//构造函数，获取Access Tokenpublic function __construct($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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