PHP development message board reply page

The last introduction to the reply function:

<?php

session_start();

header("content-type:text/html;charset=utf-8");
//连接数据库
$link = mysqli_connect("localhost","root","root","message");
mysqli_set_charset($link,"utf8");
if (!$link) {
   die("连接失败: " . mysqli_connect_error());
}
$id = isset($_GET['id'])?$_GET['id']:"";
$reply = isset($_POST['reply'])?$_POST['reply']:"";

$sql ="update details set reply='$reply' where id=".$id;

$rel = mysqli_query($link,$sql);

if($rel){
   echo"回复成功"."<br/><br/>";
   echo"<a href='list.php'>跳转至留言列表页面</a>";
}else{
   echo"回复失败"."<br/><br/>";
   echo"<a href='reply.html'>跳转至回复编辑页面</a>";
}
?>
<!DOCTYPE html>
<html>
<head>
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
   <meta name="format-detection" content="telephone=no" />
   <title>回复页面</title>
   <style>
.w410{
           width: 410px;
}
       .fon_f{
           font-family: 微软雅黑;
}
       .pt{
           padding-top: 80px;
}

   </style>
</head>

<body>
<div style="margin: 0 auto;"  class="fon_f w410">
<div>
<h1 style= "text-align:center;">留言窗口</h1>
</div>
<div style="margin: 0 auto;" class="pt lh">
   <form name="form1" method="post" action="reply.php?id=<?php echo $_GET['id']?>">
回复:<textarea style="width: 380px;height: 200px;" name="reply"></textarea><br/><br/>
       <input type="submit" value="确认回复">
   </form>
</div>
</div>
</body>
</html>

Next Section

new file

<?php

session_start();

header("content-type:text/html;charset=utf-8");
//连接数据库
$link = mysqli_connect("localhost","root","root","message");
mysqli_set_charset($link,"utf8");
if (!$link) {
 die("连接失败: " . mysqli_connect_error());
}
$id = isset($_GET['id'])?$_GET['id']:"";
$reply = isset($_POST['reply'])?$_POST['reply']:"";

$sql ="update details set reply='$reply' where id=".$id;

$rel = mysqli_query($link,$sql);

if($rel){
 echo"回复成功"."<br/><br/>";
 echo"<a href='list.php'>跳转至留言列表页面</a>";
}else{
 echo"回复失败"."<br/><br/>";
 echo"<a href='reply.html'>跳转至回复编辑页面</a>";
}

?>

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
 <meta name="format-detection" content="telephone=no" />
 <title>回复页面</title>
 <style>
.w410{
 width: 410px;
}
 .fon_f{
 font-family: 微软雅黑;
}
 .pt{
 padding-top: 80px;
}

 </style>
</head>

<body>
<div style="margin: 0 auto;" class="fon_f w410">
<div>
<h1 style= "text-align:center;">留言窗口</h1>
</div>
<div style="margin: 0 auto;" class="pt lh">
 <form name="form1" method="post" action="reply.php?id=<?php echo $_GET['id']?>">
回复:<textarea style="width: 380px;height: 200px;" name="reply"></textarea><br/><br/>
 <input type="submit" value="确认回复">
 </form>
</div>
</div>
</body>
</html>

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