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

I think something as simple as below should work to extract file extension from the file-name:

function getFileExtension($fileName)
{
    $ext = '';
    if(strpos($fileName, ".") !== false)
    {
        $ext = end(explode(".", $fileName));
    }
    return $ext;
}