Description:
------------
using php_admin_value open_basedir "/home/somthing/" in vhosts i get problems to run the function tmpfile()


vhost setting:
 php_admin_value open_basedir "/home/somthing/:/tmp/"

or tested with ... does the same error:
 php_admin_value open_basedir "/home/somthing/"



without open_basedir the function works like expected :-/

Reproduce code:
---------------
<?php
// --- tests -----------------------------------------------------------
<?php
$temp = tmpfile();
fwrite($temp, "writing to tempfile");
fseek($temp, 0);
echo 'x:'.fread($temp, 1024);
fclose($temp); // this removes the file
//----------------------------------------------------------------------
?>

Actual result:
--------------
Warning: tmpfile() [function.tmpfile]: open_basedir restriction in effect. File(/tmp) is not within the allowed path(s): (/home/abc/:/tmp/) in index.php on line 123