public function actions()
 {
     return ['upload' => ['class' => UploadAction::className(), 'upload' => 'upload'], 'remove' => ['class' => RemoveAction::className(), 'uploadDir' => '@frontend/web/upload']];
 }
 public function actions()
 {
     return ['uploadimage' => ['class' => UploadAction::className(), 'upload' => 'upload/teachers'], 'remove' => ['class' => RemoveAction::className(), 'uploadDir' => '@wwwdir/']];
 }