I have quite a brainteaser for you all.

On almost every website I create I use a MySQL backend in some form or another. And one of favorite things is MySQL's ability to store entire image files in BLOBs, and then output those with a little PHP. BUT! I have found no way to replace an image BLOB once it has been created. My PHP skills fail miserably. But I know it's possible, because I can do it through PHP MyAdmin.

This would be a huge asset to me, and I'm sure many others. So I got an Easter Basket for whoever can solve this one for me.