Description:
------------
php 4.4.1 is_dir() function always returns false on FreeBSD.
php 4.4.0 was working normally.

Reproduce code:
---------------
<?php
clearstatcache();

$dirs = array("/", "./", "../", "/usr");

foreach($dirs as $dir){
        if(is_dir($dir)==true){
                echo "dir $dir\n";
        }else{
                echo "non dir $dir\n";
        }
}
?>

Expected result:
----------------
dir /
dir ./
dir ../
dir /usr


Actual result:
--------------
non dir /
non dir ./
non dir ../
non dir /usr