beh, l'avete trovata questo script usa i file.
online.class.php
codice:
<?php
class usersOnline {
	var $users_file;
	var $timeout;
	var $timestamp;
	var $ip;
	function usersOnline($file_, $timeout_) {
		global $_SERVER;
		$this->timestamp = time();
		$ip_ = ($_SERVER['REMOTE_ADDR'] != "" && preg_match("/^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$/", $_SERVER['REMOTE_ADDR'])) ? $_SERVER['REMOTE_ADDR'] : "non rilevato";
		$this->ip = $ip_;
		$this->users_file = $file_;
		$this->timeout = $timeout_;
		$this->newUser();
		$this->deleteUser();
	}
	function newUser() {
		$content = file_get_contents($this->users_file);
		$lines = file($this->users_file);
		foreach($lines as $line) {
			$linea = explode("|", $line);
			if($linea[0] == $this->ip) {
				return;
			}
		}
		$ip = $this->ip;
		$timestamp = $this->timestamp;
		$content .= "\n$ip|$timestamp";
		writeFile($this->users_file, trim($content));
	}
	function deleteUser() {
		$file = file($this->users_file);
		foreach($file as $key => $line) {
			$linea = explode("|", $line);
			$aa = $this->timestamp - $this->timeout;
			if($linea[1] < $aa && $linea[0] != $this->ip) {
				unset($file[$key]);
			}
		}
		writeFile($this->users_file, trim(str_replace("\n\n", "\n", implode("\n", $file))));
	}
	function countVisits() {
		return count(file($this->users_file));
	}
}
?>
per applicare basta fare:
codice:
<?php
require("online.class.php");
$online = new usersonline("online.txt", 3*60);
echo "Utenti online: ".$online->countVisits();
?>
Cià