php模仿qq空间或朋友圈发布动态、评论动态、回复评论、删除动态或评论的功能（中）

<?php
   session_start();
   $uid = "";
   if(empty($_SESSION["uid"]))
   {
    header("location:login.php");
    exit;
   }
   $uid = $_SESSION["uid"];
   require "../DB.class.php";
   $db = new DB();
   $sql = "select name from qqusers where uid='{$uid}'";
   $name = $db->strquery($sql);
   echo "欢迎："."<span class='qid' yh='{$uid}'>{$name}</span>";
   ?>

 //定义空字符串，容纳评论的id  
  var code=""; 
 $(".pl").click(function(){     
    code = $(this).attr("code"); //将评论的id重新赋值                 
    }) 
//将评论写进数据库 
$("#tjpl").click(function(){
  var plnr = $(".pldt").val();
  var plid = code; //取发动态的id
  $.ajax({
  url:"pl-cl.php",
  data:{plnr:plnr,plid:plid},
  type:"POST",
  dataType:"TEXT",
  success:function(data){
   alert("评论成功！");
   window.location.href="main.php" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ;
  }      
  });            
 }) 

<?php
require "../DB.class.php";
$db = new DB();
session_start();
$uid = $_SESSION["uid"];
$plnr = $_POST["plnr"];
$dtid = $_POST["plid"];
$time = date("Y-m-d H:i:s", time());
$sql = "insert into qqpinglun values ('','{$dtid}','{$uid}','{$plnr}','{$time}')";
$db->query($sql,0);
?>

<!--读取评论内容--> 
<div id="dqpl">
<?php
 $sql = "select * from qqpinglun";
 $arr = $db->query($sql);
 foreach($arr as $v)
 {
  $sql = "select * from qqdongtai where dtid='{$v[1]}'";
  $arr2 = $db->query($sql);
  foreach($arr2 as $m)
  {
   //取发动态的姓名
   $sql = "select name from qqusers where uid='{$v[2]}'";
   $name = $db->strquery($sql);
   //若果是登录者评论则显示“我”
   if($v[2]==$uid)
   {
    $name ="我";
   }
   //获取被评论者的姓名
   $sql = "select name from qqusers where uid=(select uid from qqdongtai where dtid='{$v[1]}')";
   $bpl = $db->strquery($sql);
   echo "<div class='a'><span class='xm'>{$name}</span>评论<span class='xm'>{$bpl}</span>的动态:{$m[2]}<div>
    <div class='b'>{$v[3]}</div>
   <div class='c'>发表评论时间：{$v[4]}</div>
   <div class='d'><button class='btn btn-primary hf' ids ='{$v[0]}'>回复
   </button><span><a href='scpl-cl.php?code={$v[0]}'>删除评论</a></span></div>";
  }
 }  
?>    
</div>