PHP: Get file extension not working on uploads to S3

Question

I am using the Amazon S3 API to upload files and I am changing the name of the file each time I upload.

So for example:

Dog.png > 3Sf5f.png

Now I got

Answer 1

Untested, but simple enough to work:

$ext = pathinfo($filename, PATHINFO_EXTENSION);

will return the extension part (without the '.')