determining the file type being uploaded

[Anon]

im allowing users to upload files from a form to a mysql table. it uploads the files but i want to allow only .jpg files to be uploaded. right now im doing this:

$ext = strrchr(basename($pic_name), '.');
if(($ext != ".jpg") || ($ext != ".jpeg")) die("Your picture file must be in JPG or JPEG format!");

anybody know why this wouldnt work?
i also tried fiddling around with:

if(($pic_type != "image/jpg") || ($pic_type != "image/jpeg")) die ("Your picture must be in JPG or JPEG format!");

i get the die messages even with jpg pictures. does anybody have any input?! anything else i should try? thanks for any help!
-phil

[Anon]

i figured it out.

$ext = substr(basename($pic_name), -3);
if($ext != "jpg") error_message("Only JPG picture files allowed!");

sorry to waste bandwidth.
-phil