laravel，如何在注册后在Validator中设置默认值

use Illuminate\Support\Facades\Validator;

public function boot()
{
    Validator::extend('default_value', function ($attribute, $value, $parameters, $validator) {
        $default = $parameters[0];
        $data = $validator->getData();
        
        if (empty($value)) {
            $data[$attribute] = $default;
            $validator->setData($data);
        }
        
        return true;
    });
}

use Illuminate\Support\Facades\Validator;

$validator = Validator::make($request->all(), [
    'name' => 'required|string',
    'email' => 'required|email',
    'password' => 'required|string|min:8',
    'phone' => 'default_value:1234567890' // 设置默认值为 1234567890
]);