public static function uploadlogo($filename)
{
//获取ACCESS_TOKEN
$accessToken = AccessToken::getAccessToken();
$queryUrl = 'http://api.weixin.qq.com/cgi-bin/media/uploadimg?access_token=' . $accessToken . '&type=image';
$data = array();
$data['media'] = Curl::addFile($filename);
return Curl::callWebServer($queryUrl, $data, 'POST', 1, 0);
}