Renaming a file whilst uploading, cant get the mime type to work

[echoninja]

Hi again folks, I have an upload script for avatars/images, but I dont want them to retain their original name I want them to use the session id, now I can get the files to upload with the session ID but I cant get the extension to go on, any help?
I have currently:

[code]$ext = $_FILES['avatar']['type'];
if (move_uploaded_file($_FILES['avatar']['tmp_name'],$upload_dir.session_id() .".". $ext)) {
[/code]

[heckenschutze]

why are you renaming the files to session id?

Perhaps a timestamp is better, mainly because if you use that session_id later, the image will be overwritten.

[echoninja]

because its for user avatars, and session id's are unique. That's not important though, I cant get the mime type to add onto the end

[echoninja]

nevermind i actually found it in the membership tutorial, well the command, then used it for my own diabolical ends :) if anyone wants to know

[code]$ext = strrchr($_FILES['avatar']['name'], ".");
if (move_uploaded_file($_FILES['avatar']['tmp_name'],$upload_dir.session_id() .".". $ext)) {
[/code]

[ToonMariner]

I would still re-consider ussing the session id in teh file name. Remeber these are generated randomly - they ARE NOT unique to each user - each time you login in the seesion id will in 9 zillion cases be different to the last session id you had.

Now if you set a session variable called ID and set that to the unique identifier for the user form your database - that would be a different matter and your system would then work.

[echoninja]

I acutally decided (before reading your post) to inster $username at the start, so then it doesn't matter if they overwrite a file, because they are changing it for their avatar anyways. Thanks for the help folks