/**

     * 获取激活码

     */

    public function getnum()

    {

        $time = Db::name('fangchan_jihuoma')->group('id desc')->limit(1)->find();//从上一次生成的时间开始计算

        $num='';

        if(empty($time)){

            $num = microtime(true);

        }else{

            $num = $time['info_time'];

        }

        for ($i = $num; $i < ($num + 5); $i++) {

//            dump(substr(md5($i), 0, 6));exit;

            Db::name("fangchan_jihuoma")->insert([

                'num' => substr(md5($i), 0, 6),

                'status' => '',

                'created_time' => time(),

                'info_time' => $i

            ]);

        }

        $sql = "select count(*) as sum,num from osc_fangchan_jihuoma group by num HAVING sum>1";//查出有多少个重复的验证码和重复验证码内容

        $data = Db::query($sql);

        if(!empty($data)) {

            foreach($data as $k=> $v) {

                for($j=0;$j<$v['sum'];$j++){

                    Db::name("fangchan_jihuoma")->where('num',1)->where('status',0)->delete();删除重复的验证码

                }

            }

        }

        $this->success('激活码已生成！');

    }