Description:
------------
functions: opendir, readdir, scandir etc... 
1. can`t read/open russian named directories.
2. question marks are returned as a name of file while reading dir.
3. file exists write when create russian name directory

Reproduce code:
---------------
<?php  
  mkdir('./?????????????'); // there is russian named dir...
  $x = scandir('.');
  print_r($x);
  echo "<br />{$x[2]}\n<br />";
  chdir($x[2]);
  $x = scandir('.');
  print_r($x);
?>

Expected result:
----------------
I explected to create dir "?????????????" and go to this dir.

Actual result:
--------------
Warning: mkdir() [function.mkdir]: File exists in D:\www\bad\index.php on line 2
Array ( [0] => . [1] => .. [2] => ????????????? [3] => index.php )
?????????????
Array ( [0] => . [1] => .. [2] => ????????????? [3] => index.php )