$form = new MyForm();

        if ($form->load(Yii::$app->request->post()) && $form->validate())  {
            $name = $form->name;
            $email = $form->email;
            $form->file = UploadedFile::getInstance($form, 'file');
            $form->file->saveAs('photo/'.$form->file->baseName.'.'.$form->file->extension);
        }