Laravel验证-如何返回已选择的相同类别和子类别？

use Illuminate\Http\Request;
use Illuminate\Support\Facades\Validator;

public function validateCategory(Request $request)
{
    $categories = [
        'category1' => [
            'subcategory1',
            'subcategory2',
            'subcategory3',
        ],
        'category2' => [
            'subcategory4',
            'subcategory5',
            'subcategory6',
        ],
        // 其他类别和子类别
    ];

    $validator = Validator::make($request->all(), [
        'category' => 'required|in:'.implode(',', array_keys($categories)),
        'subcategory' => 'required|in:'.implode(',', array_flatten($categories)),
    ]);

    if ($validator->fails()) {
        // 验证失败，返回错误信息
        return response()->json(['errors' => $validator->errors()], 400);
    }

    // 验证通过，继续处理其他逻辑
    // ...

    return response()->json(['message' => '验证通过'], 200);
}