关键字：Memcacheaccess_token 更新 存储 7200 本文介绍如何 使用 缓存 Memcache 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720
关键字：memcache access_token 更新 存储 7200
本文介绍如何使用缓存Memcache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
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}
二、Memcache
Memcache是一个高性能的分布式的内存对象缓存系统，通过在内存里维护一个统一的巨大的hash表，它能够用来存储各种格式的数据，包括图像、视频、文件以及数据库检索的结果等。简单的说就是将数据调用到内存中，然后从内存中读取，从而大大提高读取速度。
Memcache是danga的一个项目，最早是LiveJournal 服务的，最初为了加速 LiveJournal 访问速度而开发的，后来被很多大型的网站采用。
Memcached是以守护程序(监听)方式运行于一个或多个服务器中，随时会接收客户端的连接和操作。
三、实现
<?<span>php
</span><span>/*</span><span>
方倍工作室 http://www.cnblogs.com/txw1958/
CopyRight 2014 All Rights Reserved
</span><span>*/</span>
<span>define</span>("APPID", "wx1111111111111111"<span>);
</span><span>define</span>("APPSECRET", "11111111111111111111111111111111"<span>);
</span><span>$weixin</span> = <span>new</span><span> class_weixin();
</span><span>var_dump</span>(<span>$weixin</span><span>);
</span><span>class</span><span> class_weixin
{
</span><span>var</span> <span>$appid</span> =<span> APPID;
</span><span>var</span> <span>$appsecret</span> =<span> APPSECRET;
</span><span>//</span><span>构造函数，获取Access Token</span>
<span>public</span> <span>function</span> __construct(<span>$appid</span> = <span>NULL</span>, <span>$appsecret</span> = <span>NULL</span><span>)
{
</span><span>if</span>(<span>$appid</span> && <span>$appsecret</span><span>){
</span><span>$this</span>->appid = <span>$appid</span><span>;
</span><span>$this</span>->appsecret = <span>$appsecret</span><span>;
}
</span><span>$mem</span> = <span>new</span><span> Memcache;
</span><span>$mem</span>->connect('localhost', 11211) or <span>die</span> ("Could not connect"<span>);
</span><span>$this</span>->access_token = <span>$mem</span>->get('access_token'<span>);
</span><span>if</span> (<span>empty</span>(<span>$this</span>-><span>access_token)){
</span><span>$url</span> = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=".<span>$this</span>->appid."&secret=".<span>$this</span>-><span>appsecret;
</span><span>$res</span> = <span>$this</span>->http_request(<span>$url</span><span>);
</span><span>$result</span> = json_decode(<span>$res</span>, <span>true</span><span>);
</span><span>$this</span>->access_token = <span>$result</span>["access_token"<span>];
</span><span>$mem</span>->set('access_token', <span>$this</span>->access_token, 0, 7200<span>);
}
}
</span><span>//</span><span>HTTP请求（支持HTTP/HTTPS，支持GET/POST）</span>
<span>protected</span> <span>function</span> http_request(<span>$url</span>, <span>$data</span> = <span>null</span><span>)
{
</span><span>$curl</span> =<span> curl_init();
curl_setopt(</span><span>$curl</span>, CURLOPT_URL, <span>$url</span><span>);
curl_setopt(</span><span>$curl</span>, CURLOPT_SSL_VERIFYPEER, <span>FALSE</span><span>);
curl_setopt(</span><span>$curl</span>, CURLOPT_SSL_VERIFYHOST, <span>FALSE</span><span>);
</span><span>if</span> (!<span>empty</span>(<span>$data</span><span>)){
curl_setopt(</span><span>$curl</span>, CURLOPT_POST, 1<span>);
curl_setopt(</span><span>$curl</span>, CURLOPT_POSTFIELDS, <span>$data</span><span>);
}
curl_setopt(</span><span>$curl</span>, CURLOPT_RETURNTRANSFER, 1<span>);
</span><span>$output</span> = curl_exec(<span>$curl</span><span>);
curl_close(</span><span>$curl</span><span>);
</span><span>return</span> <span>$output</span><span>;
}
}
</span>?>
