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Haciendole caso al amigo de arriba, encontre un code...

<?

//online

$server = "YOUR HOST"; // usually localhost

$db_user = "USERNAME";

$db_pass = "PASSWORD";

$database = "DATABASE";

$timeoutseconds = 300; // length of gaps in the count



//get the time

$timestamp = time();

$timeout = $timestamp-$timeoutseconds;



//connect to database

mysql_connect($server, $db_user, $db_pass);

//insert the values

$insert = mysql_db_query($database, "INSERT INTO useronline VALUES

('$timestamp','$REMOTE_ADDR','$PHP_SELF')");

if(!($insert)) {

print "";

}

//delete values when they leave

$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");

if(!($delete)) {

print "";

}

//grab the results

$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='$PHP_SELF'");

if(!($result)) {

print "";

}

//number of rows = the number of people online

$user = mysql_num_rows($result);

if(!($user)) {

print("ERROR: " . mysql_error() . "\n");

}

//spit out the results

mysql_close();

print("$user");



?>
Voy a testearlo.