[PHP] is_dir & is_file bugs?

[Afan Pasalic]

I have script that create directories after item's name and each 
directory has 2 images: big image and it's thumbnail (both jpgs)
But, when I run this code:

   $path = 'product_images';
   $handle = opendir($path);
   while (false !== ($file = readdir($handle)))
   {
        if ($file != "." && $file != "..")   
       {
echo $file;
           if (is_dir($file))
           {
               echo ' <-- folder<br>';
               $folders[] = $file;
           }
           elseif (is_file($file))
           {
               echo ' <-- image<br>';
               $images[] = $file;
           }
           else
           {
               echo ' <-- ???<br>';
           }
       }
   }

I'm getting  "<-- ???" for every folder created by script, and "<-- 
folder" for folders created manualy.

What could cause a problem?
-afan
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