realPath on Windows IIS

Using PHP on Windows with IIS is a nightmare. Ok, I knew it before. This made me crazy. I used the new Filehandling in Laravel. I love it. Thanks for that.

So just to inform everyone else working on Windows.

The realPath of my uploaded file was always false on Windows. On Linux it was something like "/tmp/phpfjc2ph".

Thats why the file-upload didn't work for me.