hainan/app/Admin/Forms/SystemSetting.php

<?php

namespace App\Admin\Forms;

use Dcat\Admin\Widgets\Form;

class SystemSetting extends Form
{
    /**
     * Handle the form request.
     *
     * @param array $input
     *
     * @return mixed
     */
    public function handle(array $input)
    {
		$system = \App\Models\SystemSetting::query()->firstOrCreate([
			'key' => 'withdrawal'
		]);

		$arr = [
			'agent' => $input['agent'],
			'supllier' => $input['supllier'],
			'guide' => $input['guide'],
		];
		$system->value = json_encode($arr);
		$system->save();
        return $this
				->response()
				->success('设置成功')
				->refresh();
    }

    /**
     * Build a form here.
     */
    public function form()
    {
        $this->number('agent','代理商')->min(0)->max(100)->required()->help('提现手续费 %');
		$this->number('supllier','供应商')->min(0)->max(100)->required()->help('提现手续费 %');
		$this->number('guide','地接')->min(0)->max(100)->required()->help('提现手续费 %');
    }

    /**
     * The data of the form.
     *
     * @return array
     */
    public function default()
    {
    	$system = \App\Models\SystemSetting::query()->where('key','withdrawal')->first();
    	if ($system) {
			$key = json_decode($system->value, true);
		}
        return [
            'agent'  => $key['agent'] ?? 0,
            'supllier' => $key['supllier'] ?? 0,
			'guide' => $key['guide'] ?? 0
        ];
    }
}