function message($id){   
  $query = $this->db->query("SELECT * FROM message WHERE news_id = '$id'");//或者文章id后查詢里面所有評論  
  return $query->result();   
 }

<?php foreach($query as $sel){?>
<p>留言用戶:<?php echo $sel->receiver_author;?> 留言內容:<?php echo $sel->content?></p>
<?php }?>

<form id="form1" name="form1" method="post" action="<?php echo site_url()."/publish/user_message"?>">
<textarea rows="5" cols="50" name="huifu" <?php if($uere_name == "0"){echo "disabled";}?> >
<?php
 if($uere_name == "0")
{echo "抱歉你還沒登錄不能進行留言";}
?>
</textarea>
<input class="wole" name="author" value="<?php echo $author;?>" /><!--接受方帖子作者-->
<input class="wole" name="news_id" value="<?php echo $news_idx;?>" /><!--文章id-->
<input type="submit" name="Submit"/>
</form>
<script language="javascript">
function updateinfo(){
  if(<?php echo $uere_name;?> == 1){
    document.form1.Submit.value = "留言";
    document.form1.Submit.disabled = false;
  }
  else{
    document.form1.Submit.value = "還未登錄";
 document.form1.Submit.disabled = "disabled";
  }
}
updateinfo();
</script>

<p>這里是<?php echo $is;?>樓 用戶:<?php echo $sel->receiver_author;?> <br />留言內容:<?php echo $sel->content?>&nbsp;&nbsp;&nbsp;

<a onClick="showdiv('contentid<?php echo $is;?>','showtext<?php echo $is;?>')" href="javascript:void(0)">回復</a>
<div id="contentid<?php echo $is;?>" class="none">
<?php 
 $query = $this->db->query("select * from message where son_id ='$sel->id' order by id");//獲取指定父id的子回復
 $revis = $query->result();
    foreach($revis as $row){?>
 <p><?php if($row->sender_author == $row->receiver_author){echo $row->sender_author;}
 else{ echo $row->sender_author."回復了:".$row->receiver_author;}?>
  內容是:<?php echo $row->content?></p>
<?php }?>
<form action="<?php echo site_url()."/publish/son_message"?>" method="post">
<input name="son_idx" class="wole" value="<?php echo $sel->id?>" />
<input name="receiver_author" class="wole" value="<?php echo $sel->receiver_author;?>" />
<input class="wole" name="news_id" value="<?php echo $news_idx;?>" /><!--文章id-->
<textarea rows="5" cols="50" name="huifux"></textarea>
<br><input type="submit" name="sub" value="回復"></form></div></p>
<script language="JavaScript" type="text/JavaScript">
<!--
function showdiv(targetid,objN){

      var target=document.getElementById(targetid);
      var clicktext=document.getElementById(objN)

            if (target.style.display=="block"){
                target.style.display="none";
                clicktext.innerText="回復";
 

            } else {
                target.style.display="block";
                clicktext.innerText='收起';
            }

}
-->
</script>