unlink path



I need to delet some files, so I thought of unlink.


http://us3.php.net/manual/en/function.unlink.php

Now, I'm confused by the path in the example:

<?php
$fh = fopen('test.html', 'a');
fwrite($fh, '<h1>Hello world!</h1>');
fclose($fh);

mkdir('testdir', 0777);

unlink('test.html');
unlink('testdir');
?>


What is that relative to, where the script is run? Or something else?

I assume I can do this:
unlink($_SERVER['DOCUMENT_ROOT']. '/path_relative_to_document_root') ?

Jeff

.