Problema con conteggio download

[ligimus]

Non sapendo dove mettere le mani perchè non conosco il linguaggio vi posto il codice:

<?

  $extension = "Inferno.pdf";	

  $counterdir = "conteggio"; 	

  $textfont = "Verdana,Arial";  

	if (file_exists("$get$extension"))
	{
		$count = 0;

		//header("Location: $get$extension"); // download the file [download.php?get=name_of_file]
		header("Content-Disposition: attachment; filename=$get$extension");
		readfile("$get$extension"); 

		$file = fopen("$counterdir/$get.txt","r");  // download counter
		$count = fread($file, 100);
		$countplus = ($count + 1);
		fclose($file);

		//echo "<font face=$textfont size=2>";
		//echo "<center>

$counterdir/$get.txt
";
		//echo "<center>

$countplus
";
		
		$fileb = fopen("$counterdir/$get.txt","w");
		fwrite($fileb, $countplus, 100);
		fclose($fileb);
		
		//echo "<center>

$counterdir/$get.txtb
";
		//echo "<center>

$countplus
";

		$logstr = $get;
					
		$logstr = $logstr . "\t" . date("d/m/Y");
		$logstr = $logstr . "\t" . date("H:i:s");
		//$today = getdate();
		//$logstr = $logstr . "\t" . $today['mday'] ."/". $today['mon'] ."/". $today['year'];
		//$logstr = $logstr . "\t" . $today['hours'] .":". $today['minutes'] .":". $today['seconds'];

		$logstr = $logstr . "\t" . $REMOTE_ADDR;
		$logstr = $logstr . "\t" . gethostbyaddr($REMOTE_ADDR) . "\n";
		
		$fileb = fopen("$counterdir/log.txt","a");
		
		//echo "<center>

$fileb
";
		//echo "<center>

$logstr
";

		fwrite($fileb, $logstr, 100);
		fclose($fileb);
	}
	else
	{
		echo "<font face=$textfont size=2>";
		echo "<center>

That file [$get$extension] is not available for download.
";
		echo "Please contact the server administrator webmaster.";
	}
?>