Description:
------------
'is_link($fname)' returns 'false' on windows vista, even if the file named by $fname exists and _is_ a symbolic link, regardless of if it points to a file or a directory; 

Bug #51766 MAY also be related to this problem; 


Test script:
---------------
<?php 

// precondition: directories c:\windows and c:\temp must exist

symlink('c:\windows', 'c:\temp\win'); // the link is created successfully
var_dump(is_link('c:\temp\win'));
?>


Expected result:
----------------
bool(true)

Actual result:
--------------
bool(false)