hainan/app/Models/SystemSetting.php

<?php

namespace App\Models;

use Dcat\Admin\Traits\HasDateTimeFormatter;
use Illuminate\Database\Eloquent\SoftDeletes;
use Illuminate\Database\Eloquent\Model;

class SystemSetting extends Model
{
	use HasDateTimeFormatter;
    use SoftDeletes;

    protected $table = 'system_settings';

	protected $guarded = ['id'];

	protected $casts = ['value' => 'json'];

	public static function val($key,$value)
	{
		$setting = static::query()->where('key',$key)->value('value');
		return $setting[$value] ?? null;
	}
}