Upload file sul server

[Fedayn]

<?php

// Upload file con user e pass
//-------------------------------

if (isset($_POST['username']))
    $username = $_POST['username'];
else
    $username = "";
if (isset($_POST['password']))
    $password = $_POST['password'];
else
    $password = "";
if (isset($_POST['file']))
    $file = $_POST['file'];
else
    $file = "";

$passwordOkay = 0;

if (isset($_POST['send'])) {
    $okay = checkUsernamePassword("/password.txt",$username,$password);
    if($okay) {
        $passwordOkay = 1;
        $TMPDIR = "/uploads";
        $filename = $HTTP_POST_FILES['myfile']['tmp_name'];
        $realname = $HTTP_POST_FILES['myfile']['name'];        
        if (is_uploaded_file($filename)) {
            $date = fDate();
            $time = fTime();
            $newname = ($realname . "-" . $date . "-" . $time);            
            move_uploaded_file($filename,("/uploads//".$newname));
            appendToFile("uploads//uploads.txt", $date . " " . $time . " " . $username . " " . $realname);            
            echo("Grazie, il tuo file è caricato sul server. Clicca [url='files.php']qui[/url] per vedere la lista dei file caricati.");
        }    
    }
    else
        echo("Username e/o password non corretti."); 
}


$phpself = $_SERVER['PHP_SELF'];


if(!isset($_POST['send']) || $passwordOkay == 0) {
    echo("<h2>Benvenuto alla pagina di upload</h2>");
    echo("Per favore completa il form per inviare il file.

");
    echo("<form enctype='multipart/form-data' action='$phpself' method='post'>");
    echo("<input type='hidden' name='MAX_FILE_SIZE' value='100000'>");
    echo("Username: <input type='text' name='username' value='$username'>
");
    echo("Password: <input type='password' name='password' value='$password'>
");
    echo("Document File: <input name='myfile' type='file' value='$file'>

");
    echo("<input type='submit' value='Submit the Document' name='send'>");
    echo("</form>");
}

function fDate() {
    $date = getdate();
    $monthText = $date["month"];
    $year = $date["year"];
    $mday = $date["mday"];
    return $mday . "-" . $monthText . "-" . $year;
}
    
function fTime() {
    $time = localtime();
    return $time[2] . "-" . $time[1] . "-" . $time[0];
}

function appendToFile($file,$data) {
    $out = fopen($file,"a");
    fputs($out,$data."\n");
    fclose($out);
}

function checkUsernamePassword($file,$username,$password) {
    $found=0;
    $in = fopen($file,"r");
    $line = fgets($in,4096);
    while(!feof($in) && !$found) {
        $splitLine = explode (" ", $line);
        $splitLine[1] = substr($splitLine[1],0,strlen($splitLine[1])-2);
        if($splitLine[0] == $username && $splitLine[1] == $password)
            $found=1;
        $line = fgets($in,4096);    
    }
    fclose($in);
return $found;
}
?>

Allora.. questo script mi faceva "un tempo" l'upload di un qualsiasi file sul server semplicemente inserendo username e password (contenuti nel file password.txt), ora però con PHP5 non mi funge più lo script. Dove ho sbagliato???? Grazie