Description:
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I'm setting up a virtualhost with this configuration:

    php_admin_value  open_basedir      "/home/data/web/tdo:/home/data/tdo/tmp:/home/sys/apache2/errorpages/:/usr/lib/php/:/tmp"
    php_admin_value  doc_root          "/home/data/web/tdo/"
    php_admin_value  include_path      "/home/data/web/tdo/:/home/sys/apache2/errorpages/:/usr/lib/php/"
    php_admin_value  session.save_path "/home/data/tdo/sess/"
    php_admin_value  upload_tmp_dir    "/home/data/tdo/tmp/"

a simple page that try to do a fopen and after a fwrite fail to execute, after investigating a little I'll see that it's the tempnam() function that fail, after fail the fopen, also without issuing any error, and finally the fwrite, that fire ad error:

Warning: fwrite(): supplied argument is not a valid stream resource in /home/data/web/tdo/test.php on line 7

Warning: fclose(): supplied argument is not a valid stream resource in /home/data/web/tdo/test.php on line 8

I don't see any problem in my configuration nor in my code, my php version is the version of the debian package:

PHP 5.2.0-8+etch11 (cli) (built: May 10 2008 10:35:46) 

Reproduce code:
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$tmpfname = tempnam("", "");
//it's the same with $tmpfname = tempnam("*", "");
$handle = fopen($tmpfname, "w");
fwrite($handle, "writing to tempfile");
fclose($handle);


Expected result:
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A file opened in the system TMPDIR (/tmp) or an error.