本文介紹如何存儲(chǔ)及更新 access token的方法。

一、Access Token

access_token是公眾號(hào)的全局唯一票據(jù)，公眾號(hào)調(diào)用各接口時(shí)都需使用access_token。正常情況下access_token有效期為7200秒，重復(fù)獲取將導(dǎo)致上次獲取的access_token失效。

公眾號(hào)可以使用AppID和AppSecret調(diào)用本接口來(lái)獲取access_token。AppID和AppSecret可在開(kāi)發(fā)模式中獲得（需要已經(jīng)成為開(kāi)發(fā)者，且?guī)ぬ?hào)沒(méi)有異常狀態(tài)）。注意調(diào)用所有微信接口時(shí)均需使用https協(xié)議。

接口調(diào)用請(qǐng)求說(shuō)明

http請(qǐng)求方式:?GET
https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=APPSECRET

參數(shù)說(shuō)明

返回說(shuō)明

正常情況下，微信會(huì)返回下述JSON數(shù)據(jù)包給公眾號(hào)：

{"access_token":"ACCESS_TOKEN","expires_in":7200}

?三、實(shí)現(xiàn)?

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

????//構(gòu)造函數(shù)，獲取Access?Token
????public?function?__construct($appid?=?NULL,?$appsecret?=?NULL)
????{
????????if($appid?&&?$appsecret){
????????????$this->appid?=?$appid;
????????????$this->appsecret?=?$appsecret;
????????}

????????//1.?數(shù)據(jù)庫(kù)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.?緩存形式
????????if?(isset($_SERVER['HTTP_APPNAME'])){????????//SAE環(huán)境，需要開(kāi)通memcache
????????????$mem?=?memcache_init();
????????}else?{????????????????????????????????????????//本地環(huán)境，需已安裝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.?本地寫入
????????$res?=?file_get_contents('access_token.json');
????????$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.?實(shí)時(shí)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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