[PHP知识库]laravel6从总题库中随机出固定的题

?

    /**
     * 测试随机算法
     * 总7题，随机出3题
     * @param Request $request
     */
    public function ceshi(Request $request){
        //章节题列表
        $zjans =DB::table('articles')
            ->where('category_id',6)
            ->select(['id'])
            ->get()
            ->toArray();
        //循环遍历
        foreach ($zjans as $k => $v){
            $zjans[$k] = $v->id;
        }
        //数组函数array_flip()键值对换位置
        $aa = array_flip($zjans);
        //随机抽取3道题
        $bb = array_rand($aa,3);
        $chazj = DB::table('articles')
            ->whereIn('id',$bb)
            ->get()
            ->toArray();
        dump($chazj);die;

    }