public static function avatar($account, $filename)
{
$url = 'http://api.weixin.qq.com/customservice/kfaccount/uploadheadimg?access_token=ACCESS_TOKEN&kf_account=' . $account;
$filename = realpath($filename);
if (class_exists('\\CURLFile')) {
$data['media'] = new \CURLFile($filename);
} else {
$data['media'] = '@' . $filename;
}
return parent::request($url, $data, false);
}