Problemi con il login

[ryu66]

Salve a tutti , vorrei chiedervi aiuto perchè è da giorni che mi sto impazzendo con questo script php per il login che ho adattato al mio db, riscontrando sempre lo stesso problema (quando effettuo il login mi da la risposta di benvenuto e reindirizzamento, ma oltre a non reindirizzarmi la pagina, non mi da alcun cambiamento da prima, come se non avessi effettuato nulla).
please aiutatemi.

config.php

$_CONFIG['host'] = "******";
$_CONFIG['user'] = "*******";
$_CONFIG['pass'] = "*******";
$_CONFIG['dbname'] = "*****";

$_CONFIG['table_sessioni'] = "sessioni";
$_CONFIG['table_utenti'] = "Registrazione";

$_CONFIG['expire'] = 60;


//--------------
define('AUTH_LOGGED', 99);
define('AUTH_NOT_LOGGED', 100);

define('AUTH_USE_COOKIE', 101);
define('AUTH_USE_LINK', 103);
define('AUTH_INVALID_PARAMS', 104);
define('AUTH_LOGEDD_IN', 105);
define('AUTH_FAILED', 106);

$conn = mysql_connect($_CONFIG['host'], $_CONFIG['user'], $_CONFIG['pass']) or die('Impossibile stabilire una connessione');
mysql_select_db($_CONFIG['dbname']); 

auth.lib.php

$_AUTH = array(
    "TRANSICTION METHOD" => AUTH_USE_COOKIE
);

function auth_set_option($opt_name, $opt_value){
    global $_AUTH;
    
    $_AUTH[$opt_name] = $opt_value;
}

function auth_get_option($opt_name){
    global $_AUTH;
    
    return is_null($_AUTH[$opt_name])
        ? NULL
        : $_AUTH[$opt_name];
}

function auth_clean_expired(){
    global $_CONFIG;
    
    $result = mysql_query("SELECT creation_date FROM ".$_CONFIG['table_sessioni']." WHERE uid='".auth_get_uid()."'");
    if($result){
        $data = mysql_fetch_array($result);
        if($data['creation_date']){
            if($data['creation_date'] + $_CONFIG['expire'] <= time()){
                switch(auth_get_option("TRANSICTION METHOD")){
                    case AUTH_USE_COOKIE:
                        setcookie('uid');
                    break;
                    case AUTH_USE_LINK:
                        global $_GET;
                        $_GET['uid'] = NULL;
                    break;
                }
            }
        }
    }
    
    mysql_query("
    DELETE FROM ".$_CONFIG['table_sessioni']."
    WHERE creation_date + ".$_CONFIG['expire']." <= ".time()
    );
}

function auth_get_uid(){
    
    $uid = NULL;

    switch(auth_get_option("TRANSICTION METHOD")){
        case AUTH_USE_COOKIE:
            global $_COOKIE;
            $uid = $_COOKIE['uid'];
        break;
        case AUTH_USE_LINK:
            global $_GET;
            $uid = $_GET['uid'];
        break;
    }

    return $uid ? $uid : NULL;
}

function auth_get_status(){
    global $_CONFIG;

    auth_clean_expired();
    $uid = auth_get_uid();
    if(is_null($uid))
        return array(100, NULL);

    $result = mysql_query("SELECT U.nome as nome, U.cognome as cognome, U.username as username, U.password as password
    FROM ".$_CONFIG['table_sessioni']." S,".$_CONFIG['table_utenti']." U
    WHERE S.user_id = U.id and S.uid = '".$uid."'");
    if(mysql_num_rows($result) != 1)
        return array(100, NULL);
    else{
        $user_data = mysql_fetch_assoc($result);
        return array(99, array_merge($user_data, array('uid' => $uid)));
    }
}

function auth_login($uname, $passw){
    global $_CONFIG;

    $result = mysql_query("
    SELECT *
    FROM ".$_CONFIG['table_utenti']."
    WHERE username='".$uname."' and password='".$passw."' and temp = '0'"
    );
    
    if(mysql_num_rows($result) != 1){
        return array(AUTH_INVALID_PARAMS, NULL);
    }else{
        $data = mysql_fetch_array($result);
        return array(AUTH_LOGEDD_IN, $data);
    }
}

function auth_generate_uid(){

    list($usec, $sec) = explode(' ', microtime());
    mt_srand((float) $sec + ((float) $usec * 100000));
    return uniqid(mt_rand(), true);
}

function auth_register_session($udata){
    global $_CONFIG;
    
    $uid = auth_generate_uid();
    
    mysql_query("
    INSERT INTO ".$_CONFIG['table_sessioni']."
    (uid, user_id, creation_date)
    VALUES
    ('".$uid."', '".$udata['id']."', ".time().")
    "
    );
    if(!mysql_insert_id()){
        return array(AUTH_LOGEDD_IN, $uid);
    }else{
        return array(AUTH_FAILED, NULL);
    }
}

function auth_logout(){
    global $_CONFIG;

    $uid = auth_get_uid();
    
    if(is_null($uid)){
        return false;
    }else{
        mysql_query("
        DELETE FROM ".$_CONFIG['table_sessioni']."
        WHERE uid = '".$uid."'"
        );
        return true;
    }
} 

login.php

include_once("config.php");
include_once("auth.lib.php");

list($status, $user) = auth_get_status();

if($status == AUTH_NOT_LOGGED){
    $uname = strtolower(trim($_POST['uname']));
    $passw = strtolower(trim($_POST['passw']));

    if($uname == "" or $passw == ""){
        $status = AUTH_INVALID_PARAMS;
    }else{
        list($status, $user) = auth_login($uname, $passw);
        if(!is_null($user)){
            list($status, $uid) = auth_register_session($user);
        }
    }
}

switch($status){
    case AUTH_LOGGED:
        header("Refresh: 5;URL=index.php");
        echo '<div align="center">Sei gia connesso ... attendi il reindirizzamento</div>';
    break;
    case AUTH_INVALID_PARAMS:
        header("Refresh: 5;URL=index.php");
        echo '<div align="center">Hai inserito dati non corretti ... attendi il reindirizzamento</div>';
    break;
    case AUTH_LOGEDD_IN:
        switch(auth_get_option("TRANSICTION METHOD")){
            case AUTH_USE_LINK:
                header("Refresh: 5;URL=index.php?uid=".$uid);
            break;
            case AUTH_USE_COOKIE:
                header("Refresh: 5;URL=index.php");
                setcookie('uid', $uid, time()+3600*365);
            break;
            case AUTH_USE_SESSION:
                header("Refresh: 5;URL=index.php");
                $_SESSION['uid'] = $uid;

            break;
        }
                echo $msg;
        echo '<div align="center">Ciao '.$user['nome'].'... attendi il reindirizzamento</div>';
    break;
    case AUTH_FAILED:
        header("Refresh: 5;URL=index.php");
        echo '<div align="center">Fallimento durante il tentativo di connessione ... attendi il reindirizzamento</div>';
    break;
} 

grazie in anticipo..