how to rename file but preserve suffix?

Anon

I have a script that attaches a file to an email, as well as puts the file on a file server. The thing is, I want to rename every file someone uploads to a name like 2001041187, generated from the date and a few random digits for good measure. THis is easy, but how can I tell PHP to leave the file suffix unchanged? THat is, if the original file was called jim.pdf I wnat the renamed file to be called 2001041187.pdf, automatically.
I am a real novice, and think that maybe a regular expression might be used(?) to tell PHP to only change the part of the filename that came before the period....but I am unsure.....

Thanks for any suggestions

Sam

toma42

Use the mime type supplied to set the extension. Obviously you want to NOT allow some file types...correct?

$HTTP_POST_FILES['userfile']['type']

is the mime type

Anon

Actually I don't mind what file extension they send, I just want to preserve it when renaming. I managed to do this as follows:

$fname = './'.$manuscript_name; #make the filename
ereg("....", $manuscript_name, $suffixes); #find the suffix (following the dot) for the filename and place it in the array $suffixes
$suffix = $suffixes[0]; #get the suffix from the array
$newname = gmdate("Y m d") . "$suffix"; #create a new numerical filename by concatenating the date and the original suffix

I am curious actually about the method you mentioned, I don't understand it really :^P
But I am a real novice. I will look it up to try to see what you were doing with that

Thanks!

Sam Mercer