I am running a fresh install of XAMPP 1.8.2 for OSX and am currently trying to upload an exported database that is 171kb in size.
Getting hit with this error Warning: File upload error - unable to create a temporary file in Unknown on line 0
From what I have discovered it may have something to do with write permissions to a /tmp file which doesn't seem to exist on my system.
Trying to set this up so I can make changes locally on a clients website without breaking the live site.
Cheers and thanks for taking a look.
Solved
within the file uploads section of your php.ini there resides this:
;upload_tmp_dir =
To allow for uploads uncomment and give the tmp dir a home:
upload_tmp_dir = "/tmp"
The the most recent default installation of XAMPP on Lion has a couple of very important lines commented out (in regards to phpmyadmin/mysql). Not sure why, but I would love to learn the reasoning behind it.