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

What happends if you:

$filename = "${filename}";
echo $filename;
die();

Do you get something like 'Dog.png'? If you don't there is something wrong in the way you are getting the filename. If you do get something like 'Dog.png', here is what I use to get the file extension.

$pieces = explode('.',trim($filename));
$extension = end($pieces);

Then you should be able to do this:

$params->key = rand_string(5).'.'.$extension;