How many online users

[asgsoft]

I have been working on this script:

[code]
<?php
include 'config.php';
mysql_connect("$host", "$user", "$pass") or die(mysql_error());
mysql_select_db("$dbname") or die(mysql_error());


function update_sessions()
{
    $sid = session_id();
    if($_SESSION['sitename_online'] == "1")
    {
        mysql_query("UPDATE `sessions` SET `time` = '". time() ."' WHERE `sid` = '$sid'") or die(mysql_error());
    }
    else
    {
        $_SESSION['sitename_online'] = 1;
        mysql_query("INSERT INTO `sessions` SET `time` = '". time() ."', `sid` = '$sid'") or die(mysql_error());
    }
}
function get_onlineusers()
{
    $min = time() - 301;
    mysql_query("DELETE FROM `sessions` WHERE `time` <= '$min'") or die(mysql_error());
    $query = mysql_query("SELECT COUNT(sid) FROM `sessions`");
    $num = mysql_fetch_row($query);
    return($num[0]);
}
$online_users = get_onlineusers();
echo("$online_users");
?>
[/code]

It should say how many unique visitors are online At this moment and it should change every x minuits.

It doesn't show anything but 0,

What's te problem?

[sanfly]

are you executing the first function (update sessions) anywhere? Also at the top of the page are you using session_start(); ?

[asgsoft]

so what do I need to change?