public function file($name, $id = null)
    {
        Util::operateArray($this->smsData['files'], $name, $id);

        return $this;
    }
public function file($name, $id = null)
    {
        Util::operateArray($this->smsData['files'], $name, $id);

        return $this;
    }
public function file ( $ name , $ id = null ) { Util :: operateArray ( $ this -> smsData [ 'files' ] , $ name , $ id ) ; return $ this ; }
Set voice file.

@param string|array $name
@param string|int   $id

@return $this
Set voice file .