surat/frontend/modules/frozen/models/MuseumAddForm.php

<?php
namespace frontend\modules\frozen\models;

class MuseumAddForm extends \yii\base\Model
{
    public $id_case;
    
    public function rules()
    {
        return [
            ['id_case', 'required']
        ];
    }
    
    public function attributeLabels()
    {
        return [
            'id_case' => 'ID Case',
        ];
    }
}