Description:
------------
A Script running in apache 2.0.55 (installed on drive c:) is trying to check for the existence of a directory; this is located on a raid-system, therefore outside of the webroot.

Checking for the existence of the directory with the code below using is_dir always fails, while using opendir in the manner shown works correctly. 

The same 'is_dir'-script run from the commandline works, so a connection to apache seems to exist, but neither php nor apache have any restrictions in accessing the filesytem(s).



Reproduce code:
---------------
erroneous:
<?php
if (is_dir('d:/directory'))
{
    echo 'a';
}
else
    echo 'b';
  ?>

working:
<?php
if (opendir('d:/directory'))
{
    echo 'a';
    closedir($dh);
}
else
    echo 'b';
  ?>