getaccesstoken方法

<?php
function getAccessToken($appid,$appsecret) 
{
    $mem = new CacheMemcache();
    $acc = $mem->get(‘access_token_‘.$appid);
    if (!$acc) 
    {
        $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$appid&secret=$appsecret";
        $result = https_request($url);
        $jsoninfo = json_decode($result, true);
        $access_token = $jsoninfo[‘access_token‘];
        if ($access_token) 
        {
            $expire = time() + 7000;
            $mem = new CacheMemcache();
            $mem->set(‘access_token_‘.$appid,$access_token,$expire);
        }
    }
    else 
    {
        $access_token = $acc;
    }
    return $access_token;
}
?>