Rename an uploaded file with PHP but keep the exte

Question

I'm using PHP to upload an image from a form to the server and want to rename the image lastname_firstname.[original extension]. I currently have:

move_uploaded_file($_FILES["picture"]["tmp_name"], "peopleimages/" . "$_POST[lastname]" . '_' . "$_POST[firstname]")

which, of course, renames the file lastname_firstname without an extension. How do I rename the file but keep the extension?

Thanks!

Answer 1

you could always:

$original = explode('.', $_FILES["picture"]["tmp_name"]);
$extension = array_pop($original);

move_uploaded_file($_FILES["picture"]["tmp_name"], "peopleimages/" . "$_POST[lastname]" . '_' . "$_POST[firstname]". $extension);