File Upload Name Mangling Question

I'm trying to upload a JPEG image into a database using PHP and I was successful with the upload. However today I wanted to add a check to make sure the user can only upload JPEG files and not any other files so I use preg_match() to check for the strings ".jpg" or ".jpeg" in the filename and after I've inserted this check into my code all my attempts to upload files started to fail. I was mulling over the code and I decided to print out the name of the uploaded file and to my suprise the name was mangled. Instead of it being "picture.jpg" it was "/tmp/progtemp/php/uploads/phpeZQiXd". Can anyone shed some light as to how I could check to make sure that only JPEG images get uploaded ? Thanks in advance... -Pete -- perl -e 'print pack("H*", "70766572746573406E79632E72722E636F6D0A")'

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