function get_access_token($appkey, $appsecret, $callback, $code)
{
$url = 'https://graph.renren.com/oauth/token';
$params = array('client_id' => $appkey, 'client_secret' => $appsecret, 'redirect_uri' => $callback, 'code' => $code, 'grant_type' => 'authorization_code');
$rrObj = new RenRenClient();
$rrObj->init($appkey, $appsecret);
$result = $rrObj->_POST($url, $params);
if (!empty($result->access_token)) {
return $result->access_token;
} else {
//出错处理
return $result;
}
}
