Undefined index: file - php

Question

I am getting the undefined index error as I come for the first time in my upload form page or if I move to next page and click on back button then I have the same error message.
If I upload a file then it works fine and the error message gets away.
I have also tried this:
global $file;
if (!isset($file)) {
$file = '';
}
Here is my code:
<form id="uploadForm" name="upload" enctype="multipart/form-data"/>
<fieldset>
<input type="hidden" name="MAX_FILE_SIZE" value="30000" />
<input type="file" name="file" />
<?php
echo '<pre>';
var_dump($_REQUEST['file']);
echo '</pre>';
$uploaded = new upload;
//set Max Size
$uploaded->set_max_size(350000);
//Set Directory
$uploaded->set_directory("data");
//Set Temp Name for upload.
$uploaded->set_tmp_name($_FILES['file']['tmp_name']);
//Set file size
$uploaded->set_file_size($_FILES['file']['size']);
//set file type
$uploaded->set_file_type($_FILES['file']['type']);
//set file name
$uploaded->set_file_name($_FILES['file']['name']);
//start copy process
$uploaded->start_copy();
if($uploaded->is_ok())
echo " upload is doen.";
else
$uploaded->error()."<br>";
?>
<div class="filesize">JPG minimaal 800x60 pixels max. 2Mb</div>
<span> Upload your own photo </span>
upload_inc.php
<?
class upload
{
var $directory_name;
var $max_filesize;
var $error;
var $user_tmp_name;
var $user_file_name;
var $user_file_size;
var $user_file_type;
var $user_full_name;
function set_directory($dir_name =".")
{
$this->directory_name = $dir_name;
}
function set_max_size($max_file = 2000000)
{
$this->max_filesize = $max_file;
}
function error()
{
return $this->error;
}
function is_ok()
{
if(isset($this->error))
return FALSE;
else
return TRUE;
}
function set_tmp_name($temp_name)
{
$this->user_tmp_name = $temp_name;
}
function set_file_size($file_size)
{
$this->user_file_size = $file_size;
}
function set_file_type($file_type)
{
$this->user_file_type = $file_type;
}
function set_file_name($file)
{
$this->user_file_name = $file;
$this->user_full_name = $this->directory_name."/".$this->user_file_name;
}
function start_copy()
{
if(!isset($this->user_file_name))
$this->error = "You must define filename!";
if ($this->user_file_size <= 0)
$this->error = 'File size error (0):' . $this->user_file_size . 'KB <br>';
if ($this->user_file_size > $this->max_filesize)
$this->error = 'File size error (1):' . $this->user_file_size . 'KB<br>';
if($this->user_file_type != "image/jpeg")
$this->error = "the image must be jpeg extension";
if (!isset($this->error))
{
$filename = basename($this->user_file_name);
if (!empty($this->directory_name))
$destination = $this->user_full_name;
else
$destination = $filename;
if(!is_uploaded_file($this->user_tmp_name))
$this->error = "File " . $this->user_tmp_name . " is not uploaded correctly.";
if (!move_uploaded_file ($this->user_tmp_name,$destination))
$this->error = "Impossible to copy " . $this->user_file_name . " from your folder to destination directory.";
}
}
}
?>

Answer 1

"Undefined index" means you're trying to read an array element that doesn't exist.
Your specific problem seems to be that you're trying to read upload data that doesn't exist yet: When you first visit your upload form, there is no $_FILES array (or rather, there's nothing in it), because the form hasn't been submitted. But since you don't check if the form was submitted, these lines net you an error:
//Set Temp Name for upload.
$uploaded->set_tmp_name($_FILES['file']['tmp_name']);
//Set file size
$uploaded->set_file_size($_FILES['file']['size']);
//set file type
$uploaded->set_file_type($_FILES['file']['type']);
//set file name
$uploaded->set_file_name($_FILES['file']['name']);
They're all trying to read the value of $_FILES['file'] to pass them to the methods of $uploaded.
What you need is a check beforehand:
if (isset($_FILES['file'])) {
$uploaded = new upload;
//set Max Size
$uploaded->set_max_size(350000);
//Set Directory
$uploaded->set_directory("data");
//Set Temp Name for upload.
$uploaded->set_tmp_name($_FILES['file']['tmp_name']);
//Set file size
$uploaded->set_file_size($_FILES['file']['size']);
//set file type
$uploaded->set_file_type($_FILES['file']['type']);
//set file name
$uploaded->set_file_name($_FILES['file']['name']);
//start copy process
$uploaded->start_copy();
if($uploaded->is_ok())
echo " upload is doen.";
else
$uploaded->error()."<br>";
}

Answer 2

The error is probably in your upload class. The error message is pretty clear, if that is the actual message you get there is probably a line somewhere in that class that looks for an array key I that is named 'fileUpload'.
Just do a search in your code for 'fileUpload', and add something to check if the key is set, ie
if(isset($arraywhatever['fileUpload'])) condition to your code.