Description:
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After the upgrade from old php 4.x to 5.2.0. Some of my web scripts stop working. One of the reason is the changes in tempnam() behavior which stop working with local path like "./dir" or "dir/" and force me to add system temporary folder to open_basedir path.

Configuration: 
Windows XP SP2 | PHP 5.2.0 | Apache 2.0.55 (+ php5apache2.dll)

P.S. php.exe works as expected (except DOCUMENT_ROOT is null) 
(php.exe -q 1.php)

Reproduce code:
---------------
<?php
if (!is_dir('2')) mkdir('2');

$tmpfname1 = tempnam('2/', "FOO");
$tmpfname2 = tempnam('./2/', "FOO");
$tmpfname3 = tempnam('2\\', "FOO");
$tmpfname4 = tempnam('.\2', "FOO");
$tmpfname5 = tempnam('C:\root\www\host2\www\2\\', "FOO");

echo '<pre>'."\n";
echo 'DOCUMENT_ROOT = '.$_SERVER['DOCUMENT_ROOT']."\n";
echo '$tmpfname1 = '.$tmpfname1."\n";
echo '$tmpfname2 = '.$tmpfname2."\n";
echo '$tmpfname3 = '.$tmpfname3."\n";
echo '$tmpfname4 = '.$tmpfname4."\n";
echo '$tmpfname5 = '.$tmpfname5."\n";
echo '</pre>'."\n";
?>

Expected result:
----------------
A new directory "2" and five files in it.

DOCUMENT_ROOT = C:/root/www/host2/www
$tmpfname1 = 2/FOOFA.tmp
$tmpfname2 = ./2/FOOFB.tmp
$tmpfname3 = 2\FOOFC.tmp
$tmpfname4 = .\2\FOOFD.tmp
$tmpfname5 = C:\root\www\host2\www\2\FOOFE.tmp

Actual result:
--------------
A new directory "2" and only one file in it. all other files in the windows temp folder.

DOCUMENT_ROOT = C:/root/www/host2/www
$tmpfname1 = C:\WINDOWS\TEMP\FOO10A.tmp
$tmpfname2 = C:\WINDOWS\TEMP\FOO10B.tmp
$tmpfname3 = C:\WINDOWS\TEMP\FOO10C.tmp
$tmpfname4 = C:\WINDOWS\TEMP\FOO10D.tmp
$tmpfname5 = C:\root\www\host2\www\2\FOO10E.tmp