注意：未定义的索引：第3行的C：\ xampp \ htdocs \ upload download \ editform.php中的id

Question

我在我的代码上遇到了这个问题。 idk whre和我的错误。

<?php
require 'db.php';
$id=$_REQUEST['id'];
$query = "SELECT * from upload where id='".$id."'"; 
$result = mysqli_query($connection, $query) or die ( mysql_error());
$row = mysqli_fetch_assoc($result);
?>                                 

<?php

if(isset($_GET['id']) && !empty($_GET['id']))
    {
    $title = $_POST['title'];// file title
    $date = $_POST['date'];// file date
    $ref = $_POST['ref'];// file ref
    $from_to = $_POST['from_to'];// person incharge
    $details = $_POST['details'];// details
    $location = $_POST['location'];// file location
    $status = $_POST['status'];// file status   

  $name=$_FILES['photo']['name'];
  $size=$_FILES['photo']['size'];
  $type=$_FILES['photo']['type'];
  $temp=$_FILES['photo']['tmp_name'];

$update="UPDATE upload SET title='".$title."', date='".$date."', ref='".$ref."', from_to='".$from_to."', details='".$details."', location='".$location."', status='".$status."', name='".$name."' where id='".$id."'";
mysqli_query($connection, $update) or die(mysql_error());
$status = "File Updated Successfully. </br></br><a href='view.php'>View Files</a>";
echo '<p style="color:#FF0000;">'.$status.'</p>';
}else {
?>

我是新手。我希望有人能帮助我解决这个问题。