Problema percorso php/htdocs

[Ol3iconfini]

Salve, ho un file esempio.php in htdocs, che contiene un link

[url="download.php?get=foto.jpg"][img]foto.jpg[/img][/url] 

Ho sempre in htdocs il seguente sorgente contatore.php che mi traccia le statistiche di chi scarica l'immagine:

<?

  $extension = "";         
  $counterdir = "";     

  $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 [[b]$get$extension[/b]] is not available for download.
";
        echo "Please contact the server administrator [email='webmaster@$SERVER_NAME']webmaster[/email].";
    }
?>

Successivamente ho uploadato questi due file e la foto sul server. Ora mi chiedo, perché in locale non mi appare la foto e in rete sì? E perché non funziona lo script per le statistiche?
Sbaglio qualcosa con i percorsi? Cosa devo fare esattamente con Apache? Sarà sicuramente una stupidata...
Grazie.