surat/frontend/modules/finance/models/CaseForm.php

<?php

namespace frontend\modules\finance\models;

use yii\base\Model;

class CaseForm extends Model
{
    public $id_case;
    public $items;
    public $block_no;
    public $block_amount;
    public $sent_location;
    public $sent_at;
    public $note;

    public function rules()
    {
        return [
            [['id_case'], 'required'],
            [['items'], 'safe']
        ];
    }

    public function attributeLabels()
    {
        return [
            'id_case' => 'ID Case',
            'block_no' => 'หมายเลข Block/Slide',
            'block_amount' => 'จำนวน Block/Slide',
            'note' => 'Note',
            'sent_location' => 'รายการส่ง',
            'sent_at' => 'ส่งเมื่อ',
        ];
    }
}