Description:
------------
If open_basedir is set to "/tmp/" and you do
<?php
is_dir( '/tmp' );
?>
you get a warning:
Warning: is_dir(): open_basedir restriction in effect. File(/tmp) is 
not within the allowed path(s): (/tmp/) in ..

Bug 39123 "Default for "upload_tmp_dir" changed to "/tmp" 
(regression)" (http://bugs.php.net/39123) is related. Maybe the 
regression's root is here?

Has this behaviour changed in PHP5 (e.g. 5.1.x)?

btw: the reason for not having "/tmp" in the open_basedir setting is 
that it would allow access to all directories beginning with "tmp" 
in the root filesystem.

Reproduce code:
---------------
$ php -d open_basedir=/tmp/ -d error_reporting=E_ALL \
 -d display_errors=1 -r 'echo is_dir( "/tmp" ) ? 1 : 0;'


Expected result:
----------------
1

Actual result:
--------------
Warning: is_dir(): open_basedir restriction in effect. File(/tmp) is 
not within the allowed path(s): (/tmp/) in Command line code on line 
1
0