test/app/Http/Filters/DemoFilter.php

<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2019/4/30 0030
 * Time: 14:25
 */

namespace App\Http\Filters;

class DemoFilter extends Filter
{
    protected $filters = ['title'];

    protected function title($title)
    {
        return $this->builder->where('title', $title);
    }
}