function write_log_visits()
{
$datetime = gmstrftime("%d/%b/%Y %H:%M:%S GMT", time());
$client_ip = getenv("REMOTE_ADDR");
if (empty($_SERVER['HTTP_REFERER'])) {$user_from = "not defined";} else {$user_from = getenv("HTTP_REFERER");};

$fp = fopen("logs/visits.log","a");
fwrite($fp,"[".$datetime."] - [".$client_ip."] - [".$user_from."]\r\n");
fclose($fp);
}