Problema con script PHP

Ciao a tutti chiedo aiuto per un piccolo problema con uno script php che utilizzo per visualizzare i nomi degli utenti collegati al sito.

Con questo, inserito in ogni pagina, controllo se è presente la key username nella variabile globale $_SESSION. Se c'è, la tabella 'f_navigation' viene aggiornata con data e ora dell'ultimo accesso al sito:

<?php 
if(isset($_SESSION['username'])){

        $user=$_SESSION[username'];

        $date=date('Y-m-d H:i:s');

        mysql_query("replace into f_navigation (username,time) values('$user','$date')");

}?>

Con quest'altra funzione invece, ottengo il timestamp riferito agli ultimi 5 minuti, dopodichè seleziono e visualizzo gli utenti attivi in questo modo :

 <?php 
                         $d=date('c',time()-5*60);//ultimi 5 minuti
                         $q=mysql_query("select username from f_navigation where time>'$d'");
                         if(mysql_affected_rows()>0){
                                 print
"<ul class='tools'>";
            while($users=mysql_fetch_array($q)){
                                        print 
"<li class='online'>{$users[0]}</li>";            
                                             }
                                 print "</ul>";
                         }
?>

Il tutto funziona perfettamente nella versione del sito che utilizzo in locale. Sullo spazio altervista invece nada!

Il problema sta nella prima parte di codice postata ovvero, la query non viene eseguita.

Dove sbaglio?

I colori nel testo che hai scritto non ti dicono nulla?

$user=$_SESSION[username']; 

manca un apice (prima di username).

$user=$_SESSION['username']; 

I colori nel testo che hai scritto non ti dicono nulla?

$user=$_SESSION[username']; 

manca un apice (prima di username).

$user=$_SESSION['username']; 

Si, mi dicono che ho sbagliato a scrivere. Non è quello il problema, ho specificato che in locale funziona.

[alemoppo]

La connessione al database è corretta? Hai messo la session_start()? Hai provato ad eseguire la query su phpMyAdmin?
Puoi fornirci il sorgente che effettivamente hai scritto nella pagina? (così da veder il codice colorato correttamente).

Ciao!

Ok, ho provato la query in phpmyadmin e funziona, idem la connessione al db.

Questo è il sorgente della pagina:

index.php

<?php require_once('Connections/config.php'); ?>
<?php include("includes/stats.php"); ?>
<?php
if (!isset($_SESSION)) {
  session_start();
}?>
<?php
if (!function_exists("GetSQLValueString")) {
function GetSQLValueString($theValue, $theType, $theDefinedValue = "", $theNotDefinedValue = "") 
{
  if (PHP_VERSION < 6) {
    $theValue = get_magic_quotes_gpc() ? stripslashes($theValue) : $theValue;
  }

  $theValue = function_exists("mysql_real_escape_string") ? mysql_real_escape_string($theValue) : mysql_escape_string($theValue);

  switch ($theType) {
    case "text":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;    
    case "long":
    case "int":
      $theValue = ($theValue != "") ? intval($theValue) : "NULL";
      break;
    case "double":
      $theValue = ($theValue != "") ? doubleval($theValue) : "NULL";
      break;
    case "date":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;
    case "defined":
      $theValue = ($theValue != "") ? $theDefinedValue : $theNotDefinedValue;
      break;
  }
  return $theValue;
}
}
?>
<?php
$colname_Recordset1 = "-1";
if (isset($_SESSION['username'])) {
  $colname_Recordset1 = $_SESSION['username'];
}
mysql_select_db($database_config, $config);
$query_Recordset1 = sprintf("SELECT * FROM f_user WHERE userName = %s", GetSQLValueString($colname_Recordset1, "text"));
$Recordset1 = mysql_query($query_Recordset1, $config) or die(mysql_error());
$row_Recordset1 = mysql_fetch_assoc($Recordset1);
$totalRows_Recordset1 = mysql_num_rows($Recordset1);

mysql_select_db($database_config, $config);
$query_DataTeam = "SELECT f_team.name, f_user.userName, f_team.teamID, f_team.emblem,   COUNT(f_player.teamID), f_team_rating.rating_image FROM f_team, f_coach, f_user, f_player, f_team_rating WHERE f_team.teamID=f_coach.teamID AND f_coach.userID = f_user.userID AND f_team.teamID=f_player.teamID AND f_team_rating.rating_id = f_team.rating GROUP BY f_team.teamID ASC";
$DataTeam = mysql_query($query_DataTeam, $config) or die(mysql_error());
$row_DataTeam = mysql_fetch_assoc($DataTeam);
$totalRows_DataTeam = mysql_num_rows($DataTeam);

$varuser_MyTournaments = "-1";
if (isset($_SESSION['username'])) {
  $varuser_MyTournaments = $_SESSION['username'];
}
mysql_select_db($database_config, $config);
$query_MyTournaments = sprintf("SELECT f_tournaments.tournamentName, f_tournaments.tournamentID FROM f_tournaments, f_tournaments_teams, f_team, f_coach, f_user WHERE f_tournaments.tournamentID = f_tournaments_teams.tournamentsID AND f_tournaments_teams.teamID = f_team.teamID AND f_team.teamID = f_coach.teamID AND f_coach.userID = f_user.userID AND f_user.userName = %s   AND f_tournaments.t_active = 1", GetSQLValueString($varuser_MyTournaments, "text"));
$MyTournaments = mysql_query($query_MyTournaments, $config) or die(mysql_error());
$row_MyTournaments = mysql_fetch_assoc($MyTournaments);
$totalRows_MyTournaments = mysql_num_rows($MyTournaments);

$maxRows_dataauc = 10;
$pageNum_dataauc = 0;
if (isset($_GET['pageNum_dataauc'])) {
  $pageNum_dataauc = $_GET['pageNum_dataauc'];
}
$startRow_dataauc = $pageNum_dataauc * $maxRows_dataauc;

mysql_select_db($database_config, $config);
$query_dataauc = "SELECT f_auction.auctionName, f_auction.id, f_auction.aucActive FROM f_auction";
$query_limit_dataauc = sprintf("%s LIMIT %d, %d", $query_dataauc, $startRow_dataauc, $maxRows_dataauc);
$dataauc = mysql_query($query_limit_dataauc, $config) or die(mysql_error());
$row_dataauc = mysql_fetch_assoc($dataauc);

if (isset($_GET['totalRows_dataauc'])) {
  $totalRows_dataauc = $_GET['totalRows_dataauc'];
} else {
  $all_dataauc = mysql_query($query_dataauc);
  $totalRows_dataauc = mysql_num_rows($all_dataauc);
}
$totalPages_dataauc = ceil($totalRows_dataauc/$maxRows_dataauc)-1;
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Home Page</title>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
<script type="text/javascript" src="js/topPage.js"></script>
<link href="css/menu.css" rel="stylesheet" type="text/css" />
<link href="css/stile.css" rel="stylesheet" type="text/css" />
<link href="css/reset.css" rel="stylesheet" type="text/css" />
<link href="css/table.css" rel="stylesheet" type="text/css" />
<link href='http://fonts.googleapis.com/css?family=Oswald' rel='stylesheet' type='text/css'>
<style type="text/css">
body {
    background: url(images/BG.png) no-repeat scroll 50% 10px #000000;   
}
</style>
</head>
<body>
<div id="wrapper" class="newHeader">
  <div id="doc">
    <div id="header"><a id="logo" href="index.php">masterxls</a>
<div id="navigation">
<?php include("includes/menu.php"); ?>
  </div></div>

<div id="simpleHeaderImgBanner">
  <div class="inner clearfix"></div>
</div>
      <div id="main">
        <div class="newDash" id="bodyDetails">
          <div class="bodyContent" id="bodyDash">
          <div class="inner">
            <div id="sidebar">
           <a href="edit_profile.php"> <img class="avatar" src="uploads/<?php echo $row_Recordset1['avatar']; ?>" width="88" height="88" alt="Avatar" /></a>
            <div class="clear"></div>
            <?php  echo '<h2>'.$_SESSION['username'].'</h2>';?>
            <div class="clear"></div>
            <?php include ("includes/sidebarmenu.php"); ?>
            <h4>I miei Tornei</h4>
            <?php do { ?> 
            <div style="clear:both;height:5px;"></div>            
             <ul class="rtools">
               <li class="tournaments"><a href="mymatch.php?recordID=<?php echo $row_MyTournaments['tournamentID'];?>">
<?php echo $row_MyTournaments['tournamentName']; ?></a></li>
              <?php } while ($row_MyTournaments = mysql_fetch_assoc($MyTournaments)); ?> </ul>
              <h4 class="rtitle">Mercato</h4>
              <ul class="rtools">                                  
                  <?php do { if($row_dataauc['aucActive'] == 1){?>
                    <li class="auction"><a href="myauction.php?recordID=<?php echo $row_dataauc['id']; ?>"><?php echo $row_dataauc['auctionName']; ?></a></li><?php } else {}?><div style="clear:both;height:5px;"></div>
                    <?php } while ($row_dataauc = mysql_fetch_assoc($dataauc)); ?>                       
              </ul>
            <h4 class="rtitle">Utenti Online</h4>
            <?php 
                         $d=date('Y-m-d H:i:s',time()-5*60);//last 5 minutes
                         $q=mysql_query("select username from f_navigation where time>'$d'");
                         if(mysql_affected_rows()>0){
                                 print 
"<ul class='tools'>";
            while($users=mysql_fetch_array($q)){
                                        print 
"<li class='online'>{$users[0]}</li>";                                                     }
                                 print "</ul>";
                         }
?>
            </div>         
            <div id="dashContent">
              <div class="dash_content_section">
                                <table width = "100%">
                  <tr class="title">
                                                         <td class="head">Squadra</td>
                    <td class="head">Fascia</td>
                    <td class="head">NR. Giocatori</td>
                    <td class="head">Finanze</td>
                    <td class="head">Monte Ingaggi</td>
                    <td class="head">Allenatore</td>
                  </tr>
                  <?php do { ?>
                  
                    <tr>
                      <td class="table0"><img class="playeravatar" width="40" height="40" src="uploads/emblem/<?php echo $row_DataTeam['emblem']; ?>"><a href="teamview.php?recordID=<?php echo $row_DataTeam['teamID']; ?>"> <?php echo $row_DataTeam['name']; ?></a></td>
                      <td class="table1"><img src="http://forum.it.altervista.org/images/teamrank/<?php echo $row_DataTeam['rating_image']; ?>"/></td>
                      <td class="table1"><?php echo $row_DataTeam['COUNT(f_player.teamID)']; ?></td>
                      <td class="table1">&nbsp;</td>
                      <td class="table1">&nbsp;</td>
                     <td class="table1lastfield"><?php echo $row_DataTeam['userName']; ?></td>
                    </tr>
                    <?php } while ($row_DataTeam = mysql_fetch_assoc($DataTeam)); ?>
                </table>                
              </div>             
            </div>
              <div class="clear"></div>
            </div>
          </div>
        </div> 
        <div class="clear"></div>
    </div> 
    <div class="wrapperFooter">      
        <div class="footer">
        <?php include("includes/footer.php"); ?>
        </div>
        <div class="copyright"><?php include("includes/copyright.php"); ?></div>
        </div> 
</div>
</div>
<div id='topPage'>
<a href=''></a>
</div>
</body>
</html>
<?php
mysql_free_result($Recordset1);

mysql_free_result($DataTeam);

mysql_free_result($MyTournaments);

mysql_free_result($dataauc);
?>

stats.php = (il codice postato all'inizio del topic)

La tabella:

CREATE TABLE  `navigation` (
  `username` varchar(50) NOT NULL,
  `time` datetime NOT NULL,
  PRIMARY KEY (`username`)
) 

Ho risolto spostando più in basso:

<?php include("includes/stats.php"); ?>

Grazie