//收到的主评论

        $message = (new coachModel())->coachMessge($param); print_r($message);die;


//组装主评论下的跟评论

        $temp=array_column($message,'id');
        $messagelists=CoachProblemModel::where('pid','in',$temp)
            ->field(['id','coach_id','create_time','member_id','is_reply','content','reply_id','pid'])
            ->select()->toArray();
        print_r($messagelists);die;


根据$message里的id值,获取$messagelists数组里所有pid值跟id值相同的重组在$message['reply']字段下,期望结果如下:
//代码实现如下:

        $pidMap = array_combine(array_column($message, 'id'), $message);

        array_reduce($messagelists, function($carray, $item) use (&$pidMap) {
            if (isset($pidMap[$item['pid']])) {
                if (isset($pidMap[$item['pid']]['reply'])) {
                    $pidMap[$item['pid']]['reply'] []=  $item;
                } else {
                    $pidMap[$item['pid']]['reply'] []= $item;

                }
            } else {
                $pidMap[] = $item;
            }
        }, []);
        print_r($pidMap);die;

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