problems uploading files through a form

[raamay]

i have a form which allows files to be uploaded. i have no problem with the upload script as it works perfectly within my local web server. As i host it in my hosting server the upload do not work. i have checked for the php settings in both my local server as well as my hosting server. I have set the local settings as in the hosting server with a few things not identical. One is the upload_tmp_dir which is set in my server but not in the hosting server. So, after some googling i could come across the problem of upload_tmp_dir which could be a reason in my case. So, how should i confirm this or solve this problem?

if you would like to view my code, its here:

function($fname, $tmpfile){
$ext = str_replace(".","",strtolower(substr($fname, -4, 4))); 
$new = strtotime("now");
$newname = $new.".".$ext;
if(move_uploaded_file($tmpfile, "files/{$newname}")) {
   ...... then here goes the code to insert the form 
values along with the file path
}
}

[Markus]

Try turning on error reporting to aid with debugging.

Do you have access to the server (more precisely, PHP's configuration)?

[TheServant]

So echo ini_get('upload _tmp_dir'); returns NULL?

I think that it's set in your php.ini file. Do you have access to that?
Add this to your php.ini (if it's not already there) to try a test:
file_uploads = On
upload_tmp_dir = {your directory}

I am sorry if you have already tried this, but let's just make sure the thing is plugged in!

[raamay]

since you are online, i submit the error that i get when i try to upload a file. i have put on error reporting. The following is the error:

Warning: move_uploaded_file(files/1253849403.doc) [function.move-uploaded-file]: failed to open stream: Permission denied 
Warning: move_uploaded_file() [function.move-uploaded-file]: Unable to move '/var/tmp/phpHBrCgj' to 'files/1253849403.doc'

May be you have some idea about this. Its surely to do with the upload_tmp_dir.

[zorgi]

Permission denied

May be you have some idea about this. Its surely to do with the upload_tmp_dir.

Try changing permissions for that directory/file