filetype and filesize without file.

[Anon]

I use this script to list the files of a folder:

$dir = dir($pathofCSVs);
while($filename = $dir->read())
{
if (filetype($filename) != "dir")
{
echo "<li>(".filetype($filename). " ". filesize($filename).")$filename\n";
}
}

filetype() almost doesn't show anything useful to me.
filesize() doesn't return anything at all.

How do I get the file type without opening each file?
All files are located outside the webtree.