Weird virtual() behavior for nested require()

I'm getting a weird behavior when virtual() calls another page that uses a require(). The behavior seems contrary to the docs for virtual. Consider these four files:

    ------ foo.php ------
    This is foo.
    <?php virtual('subdir/bar.php'); ?>

    ------ foo.shtml ------
    This is foo.
    <!--#include virtual="subdir/bar.php"-->

    ------ subdir/bar.php ------
    This is bar.
    <?php require('./baz.php'); ?>

    ------ subdir/baz.php ------
    This is baz.

According to the docs, virtual() handles the argument as an Apache subrequest -- in other words, it should be equivalent to an SSI include. But it's not. As I would expect, foo.shtml produces this:

    This is foo. This is bar. This is baz.

Here's what I get from foo.php:

    This is foo. This is bar.
    Warning: main(./baz.php): failed to open stream: No such file or directory in
    /blah/blah/blah/subdir/bar.php on line 2

    Fatal error: main(): Failed opening required './baz.php' (include_path='.:/usr/local/lib/php')
    in /blah/blah/blah/subdir/bar.php on line 2

Oddly, it works if bar.php says require('baz.php') instead of require('./baz.php'). That smells really bad. Is this a bug, or am I missing something? Cheers, Paul _________________________________________________________________ "After hearing ten thousand explanations, a fool is no wiser. But an intelligent person needs only two thousand five hundred."

                                                   -- Mahabharata