public function beforeSave ($insert){
        if ($file = UploadedFile::getInstance($this, 'file')){
            $dir = Yii::getAlias('@images').'/dop/';
            if(!file_exists($dir)){
                FileHelper::createDirectory($dir);
            }
            if (file_exists($dir.$this->tz_doc)){

            }
           /* if(file_exists($dir.'50x50/'.$this->image)){

            }
            if(file_exists($dir.'800x/'.$this->image)){

            }*/
            $this->tz_doc = strtotime('now').'_'.Yii::$app->getSecurity()->generateRandomString(6) .'.'.$file->extension;
            $file->saveAs($dir.$this->tz_doc);
           /* $imag = Yii::$app->image->load($dir.$this->image);
            $imag->background('#fff',0);
            $imag->resize('50','50');
            $imag->crop('50',50);
            $imag->save($dir.'/50x50'.$this->image,90);
            $imag = Yii::$app->image->load($dir.$this->image);
            $imag->background('#fff',0);
            $imag->resize('800',null, Yii\image\drivers\Image::INVERSE);
            $imag->save($dir.'/800x'.$this->image,90);*/
            if ($file2 = UploadedFile::getInstance($this, 'file2')){
                $dir = Yii::getAlias('@images').'/dop/';
                if(!file_exists($dir)){
                    FileHelper::createDirectory($dir);
                }
                if (file_exists($dir.$this->doc)){

                }
               /* if(file_exists($dir.'50x50/'.$this->image)){

                }
                if(file_exists($dir.'800x/'.$this->image)){

                }*/
                $this->doc = strtotime('now').'_'.Yii::$app->getSecurity()->generateRandomString(6) .'.'.$file2->extension;
                $file->saveAs($dir.$this->doc);
               /* $imag = Yii::$app->image->load($dir.$this->image);
                $imag->background('#fff',0);
                $imag->resize('50','50');
                $imag->crop('50',50);
                $imag->save($dir.'/50x50'.$this->image,90);
                $imag = Yii::$app->image->load($dir.$this->image);
                $imag->background('#fff',0);
                $imag->resize('800',null, Yii\image\drivers\Image::INVERSE);
                $imag->save($dir.'/800x'.$this->image,90);*/
        }
        return parent::beforeSave($insert);
    }