hainan/app/Http/Controllers/Api/CategoryController.php

<?php

namespace App\Http\Controllers\Api;
use App\Common\ProductStatus;
use App\Http\Controllers\Controller;
use App\Models\AgentProduct;
use App\Models\Category;
use Illuminate\Http\JsonResponse;

class CategoryController extends Controller
{
	# 推荐页分类列表
    public function index(): JsonResponse
	{
		$list = Category::query()
			->where('agent_id', $this->agent_id)
			->orderBy('sort')
			->get(['id', 'name', 'pid']);
		if ($list->isEmpty()) { //如果是新入驻商户，显示默认数据
			if (AgentProduct::where('agent_id', $this->agent_id)->withTrashed()->count() === 0 && request('page', 1) <= 2) { //只获取2页数据
				$list = AgentProduct::list($this->agent_id)->orWhere([['status', '=', ProductStatus::ON_SALE], ['price', '>', 500]])->orderBy('id')->simplePaginate();
			}
		}
		return $this->success($list);
	}

	# 首页频道获取的分类列表（无论分类有几级都只显示两级）
	public function index_channel(): JsonResponse
	{
		$list = Category::query()
			->where('agent_id', $this->agent_id)
			->orderBy('sort')
			->get(['id', 'name', 'pid'])->toArray();

		$list = array_column($list, null, 'id');
		foreach ($list as &$v) {
			if ($v['pid'] == 0) continue;

			$parent_pid = $list[$v['pid']]['pid'];
			while ($parent_pid != 0) {
				$v['pid'] = $parent_pid;
				$parent_pid = $list[$parent_pid]['pid'];
			}
		}
		return $this->success(array_values($list));
	}
}