Insert/Auto Delete Users Online

[kiss]

0. See demo at the front page of Mfws.Ro
1. Create a file, named online.dat and give permission 666
2. Create a file, named online.php and give permission 644
online.php

<?php
$expire = 900; //seconds
$dbfile = "online.dat";
if(!is_writable($dbfile))
{
die("Data file ".$dbfile." is not writable");
}
if(!file_exists($dbfile))
{
die("Data file ".$dbfile." was not found");
}
function netip()
{
if(!empty($_SERVER["HTTP_CLIENT_IP"]))
{
$ip = $_SERVER["HTTP_CLIENT_IP"];
}else if(!empty($_SERVER["HTTP_X_FORWARDED_FOR"]))
{
$ip = $_SERVER["HTTP_X_FORWARDED_FOR"];
}else{
$ip = $_SERVER["REMOTE_ADDR"];
}
return $ip;
}
function counter()
{
global $dbfile, $expire;
$cur_ip = netip();
$cur_time = time();
$dbary_new = array();
$dbary = unserialize(@file_get_contents($dbfile));
if(is_array($dbary))
{
while(list($user_ip, $user_time) = each($dbary))
{
if(($user_ip != $cur_ip) && (($user_time + $expire) > $cur_time))
{
$dbary_new[$user_ip] = $user_time;
}
}
}
$dbary_new[$cur_ip] = $cur_time;
$fp = fopen($dbfile, "w");
fputs($fp, serialize($dbary_new));
fclose($fp);
$out = sprintf("%02d", count($dbary_new));
return $out;
}
$online = counter();
echo date("D, d.m.Y - H:i:s")."\n";
echo "<br/>\n";
echo "Now: <b>".$online."</b>,\n";
echo "You: <b>".netip()."</b>\n";
?>

3. Create a file, named index.php and insert this code after <body>
index.php

include("online.php"); 

or

<?php
include("online.php"); 
?>