https://developers.weixin.qq.com/doc/offiaccount/OA_Web_Apps/Wechat_webpage_authorization.html

get请求获取access_token   https://api.weixin.qq.com/sns/oauth2/access_token?appid=APPID&secret=SECRET&code=CODE&grant_type=authorization_code

curl_getinfo 获取返回数据打印出来http_code  = 0 是什么原因。我这边请求这个接口耗时很长。直接在服务器端运行curl 都是秒响应的。但通过php 执行就响应好长时间 还会失败，偶尔还会成功，不过耗时较长

/**
 * GET 请求
 * [@param](/user/param) string $url
 */
private function http_get($url) {
    $oCurl = curl_init();
    if (stripos($url, "https://") !== FALSE) {
        curl_setopt($oCurl, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($oCurl, CURLOPT_SSL_VERIFYHOST, FALSE);
        //curl_setopt($oCurl, CURLOPT_SSLVERSION, 1); //CURL_SSLVERSION_TLSv1
    }
    curl_setopt($oCurl, CURLOPT_URL, $url);
    curl_setopt($oCurl, CURLOPT_RETURNTRANSFER, 1);
    $sContent = curl_exec($oCurl);
    $aStatus = curl_getinfo($oCurl);
    curl_close($oCurl);
    log_message('error','请求aStatus：'.json_encode($aStatus),'crul_http_get');
    if (intval($aStatus["http_code"]) == 200) {
        log_message('debug','curl请求成功。','crul_http_get');
        return $sContent;
    } else {
        log_message('debug','curl请求失败。','crul_http_get');
        return false;
    }
}