Shutdown Order

I have this code:

class Test
{
public $status = 'dead'
function __construct() { $this->status = 'alive' }
function __destruct() { echo '<br>__destruct()' }
}
$o = new Test;

function shutdown()
{
echo '<br>shutdown()'
}
register_shutdown_function('shutdown');

function obflush( $s )
{
global $o;
return $s . '<br>obflush() ' . $o->status;
}
ob_start('obflush');

Which (using PHP 5.1.4) produces this output:

shutdown()
__destruct()
obflush() alive

I have two questions:

1) I have read that the order in which the three functions are called has
changed previously and is likely to change again in future versions of PHP.
Does this mean I cannot rely on this order at all?

2) Why is $o still "alive" in obflush() even though its destructor has been
called before? The destructor having been called, I would expect global $o
to point to a no longer existing variable (thus, "null").

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