Consider the following scenario:

$ pwd
/tmp
$ find a
a
a/z.php
$ cat a/z.php 
<?php

$p = dirname(__FILE__);
echo "p = '$p'\n";

?>

Now let's run this from /tmp in both php and hippyvm (e.g. php a/z.php):

PHP gives:

p = '/tmp/a'

Hippy gives:

p = '.'

• dirname() is supposed to give an absolute path.
• The wrong path is reported regardless of absolute/relative paths.