Anyway to do it? I know you can use a variable's contents as a
variable name with $$name, but I'd like to do it the other way around.

<?php
function foo($bar)
{
return $bar;
}

$name = foo($variable_name);
?>

I'd like the function foo to return a string of the variable name
passed to it, in this case 'variable_name'. A friend of mine who does C
++ programming says that pointers are the way to go here, but as far
as I know PHP doesn't support them.