/**
* @param $names
* @param callable $cb
*/
public function uploadImage($token, $img, $cb)
{
$e = static::decodeToken($token);
if ($e === false) {
call_user_func($cb, false);
}
list($id, $rnd) = $e;
$this->captcha->updateOne(['_id' => $id, 'rnd' => $rnd], ['$set' => ['img' => new \MongoBinData($img, \MongoBinData::BYTE_ARRAY)]], $cb);
}