Calculating Disk Usage...

[Anon]

I have this script that I have been using to calculate how much disk space is in a given directory:

function du($dirPath)
{
$count = 0;
$dir = dir($dirPath);
while ($file = $dir->read())
{
if ( $file == ".." || $file == "." || substr($file,0,1) == "." )
continue;

	$file = $dirPath . "/" . $file; // get the full path 

	if (is_file($file)) // a file? 
		{ 
			$count += filesize($file); 
		} 
else if (is_dir($file)) // a sub-directory? then recursively scan it 
	{ 
		$count += du($file); 
	} 
} 
$dir->close(); 

return($count); 

}

It appears that this scrpt is not working properly. I get different numbers when I run this, and then if I telnet to the box and run a du from the command line.

Any ideas to make the work?

all help is appreciated...