Description:
------------
Due to a bug with the ftp_*list functions I had to set the TMPDIR manually.
[http://bugs.php.net/bug.php?id=28865]

But, to my surprise, this doesn't ALWAYS work correctly. I'll demonstrate it with the function sys_get_temp_dir and tmpfile.

Details:
If the putenv fails, than it doesn't work to direct try it again. I really have to wait for a few seconds, before a retry will be succesfull. When it works again, it does it for a few minutes.

I use PHP 5.2.5, but I saw no issues in the changelog witch seem to be related to this.

Reproduce code:
---------------
<?
putenv("TMPDIR=/Users/lvdgraaff/Web/www/compile/tmp");

echo "GET ENV: \t" . getenv("TMPDIR") . "\n";
echo "SGTD: \t\t" . sys_get_temp_dir() . "\n";
print_r(tmpfile());

NOTE: this was the only code in the whole file

Expected result:
----------------
GET ENV: 	/Users/lvdgraaff/Web/www/compile/tmp
SGTD: 		/Users/lvdgraaff/Web/www/compile/tmp
Resource id #2

NOTE: I get this, most of the time, but not ALL the time.


Actual result:
--------------
GET ENV: 	/Users/lvdgraaff/Web/www/compile/tmp
SGTD: 		/var/folders/4T/4TDJmSQYGV04rPNp5PKZ2++++TI/-Tmp-/

(note: no resource, but an empty line!)

SOMETIMES I get this result.