is_flie & !is_dir

Hi, I seem to be getting some very strange results with this piece of code. I am trying to list all the files (not directories) in the directory above the current one: if ($handle = opendir('..')) { while (false !== ($file = readdir($handle))) { if(!is_dir($file)){ echo "$file<br>"; } } closedir($handle); } Using this I get all the files in the above directory, but two of the directories as well. If I change if(!is_dir($file)){ to if(is_file($file)){ I get seven out of twenty of the files from the CURRENT directory. This seems completely bizarre! Any comments would be greatly appreciated.