本文介紹如何存儲及更新 access token的方法。

一、Access Token

access_token是公眾號的全局唯一票據，公眾號調用各接口時都需使用access_token。正常情況下access_token有效期為7200秒，重復獲取將導致上次獲取的access_token失效。

公眾號可以使用AppID和AppSecret調用本接口來獲取access_token。AppID和AppSecret可在開發模式中獲得(需要已經成為開發者，且帳號沒有異常狀態)。注意調用所有微信接口時均需使用https協議。

接口調用請求說明http請求方式: GET

https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=APPSECRET

參數說明參數是否必須說明

grant_type是獲取access_token填寫client_credential

appid是第三方用戶唯一憑證

secret是第三方用戶唯一憑證密鑰，既appsecret

返回說明

正常情況下，微信會返回下述JSON數據包給公眾號：{"access_token":"ACCESS_TOKEN","expires_in":7200}

三、實現

class class_weixin

{

var $appid = APPID;

var $appsecret = APPSECRET;

//構造函數，獲取Access Token

public function __construct($appid = NULL, $appsecret = NULL)

{

if($appid && $appsecret){

$this->appid = $appid;

$this->appsecret = $appsecret;

}

//1. 數據庫形式

/*

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環境，需要開通memcache

$mem = memcache_init();

}else { //本地環境，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. 實時拉取

$url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=".$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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