Correction: It's debian etch, not Ubuntu.

Can you replicate this issue and provide the code you're using?

I can't duplicate your problem. Here's my code:

file-upload.php (I use uniqid() to generate the UPLOAD_IDENTIFIER):
<form action="file-upload.php" method="post" enctype="multipart/form-data">
<input type="text" name="UPLOAD_IDENTIFIER" value="46ce4381a64ee" />
<input type="file" name="upload_file" />
<input type="submit" value="Send" />
</form>

I pick a rather large file and set it to upload, then I open a new browser window/tab and browse to upload-progress.php?id=46ce4381a64ee

Code for upload-progress.php:
<?php
var_dump(uploadprogress_get_info($_GET['id']));
?>

Seems to work for me, and when I check /tmp, the file is there during the upload process.

I am having the same problem that it is not writing a temp file.

uploadprogress shows up in phpinf(); and I have PHP 5.2.4

My /tmp directory is 777 and here is my code, I made a simple simple form to test it:

<form method="post" enctype="multipart/form-data">
	
	<input type="hidden" name="UPLOAD_IDENTIFIER" value="<?=uniqid()?>">
	
	<input type="file" name="file">
	
	<input type="submit">
</form>

Some folks may be having issues if the upload_max_filesize ini variable is smaller than the file they are attempting to upload.  I found that if the file I was attempting to upload was larger than the allowed size, uploadprogress_get_info() would always return null.

With 5.2.5 and 5.2.6RC1 on Gentoo, I get null from uploadprogress' info method as well, presumably because the temp file is not being written during the upload (I have verified that it is not being written).

Under CentOS 4 running PHP 5.2.4 (the old server), this works without issue.  I cannot downgrade to this version within the portage tree, so I may just manually install 5.2.4 and see if this solves the problem.

I can also confirm that this happens on CentOS 4 with PHP 5.2.5 under suphp

however not in all instances, rarely but on some occasions the temporary files are created but remain empty and uploadprogress_get_info() returns NULL each time

I'm on Ubuntu Feisty and was having this same problem (no temp file being written), and it turned out to be caused by the Suhosin hardening patch.  Upgrading the Suhosin extension to the latest version fixed the problem.  It took 3 hours to track down!

the  Suhosin extension problem is solved. I didn't get more 
info to actually track down the problem

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