Administrator / test_1

  <?php
  namespace backend\models;
  
  use yii\base\Model;
  use yii\web\UploadedFile;
  
  /**
   * UploadForm is the model behind the upload form.
   */
  class ImageSizerForm extends Model
  {
      /**
       * @var UploadedFile file attribute
       */
      public $file;

      public $width;
      public $height;
      public $field;
      public $model;
      public $form;

      public $multi;

      public $old_img;

  
      /**
       * @return array the validation rules.
       */
      public function rules()
      {
          return [
              [['width', 'height'], 'integer'],

              [['field', 'multi','old_img'], 'string', 'max' => 255],
              [['model', 'form',], 'string'],

              [['file'], 'file'],
          ];
      }
  }