How to show the output with this DBS

Question

<?php
$namaprogram = "dbs";
function papar (_____);
{
echo $namaprogram1;
echo $namaprogram2;
}
papar("____");
?>

Answer 1

What would the expected output look like?

Answer 2

Is look the output is DBS

Answer 3

But there are two `echo` statement, there are also missing variables <$namaprogram1> and <$namaprogram2>.