Description:
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When safe_mode is enabled mkdir('newdir/',0770); doesnt function. When safe_mode is disabled it functions fine. Sure, there shouldnt be a trailing slash there perhaps but most PHP software uses paths similar to '/home/user/domain/test/' so this is a problem.

This appeared in 5.2.3 or 5.2.4 I am not so sure.

This is not a permissions based problem as the folder is created when backslash is not used in safe_mode, and it is created when backslash is used and NOT in safe_mode

It seems to be the same bug with(perhaps somehow reintroduced?):
http://bugs.php.net/bug.php?id=16638

Reproduce code:
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<?php
  mkdir('myhomefolder/',0770);
  //mkdir('myhomefolder',0770);
?>

The problem is the trailing slash and safe_mode...

Expected result:
----------------
myhomefolder should get created.

Actual result:
--------------
Warning: mkdir(): Unable to access myhomefolder/ in /home/user/domain/test.php on line 3