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| | скачал в нете, интересно это полный скрипт?
<?
$server = "localhost";
$db_user = "user";
$db_pass = "pass";
$database = "table";
$timeoutseconds = 300;
$timestamp=time();
$timeout=$timestamp-$timeoutseconds;
mysql_connect($server, $db_user, $db_pass) or die ("Error1");
mysql_db_query($database, "INSERT INTO useronline VALUES ('$timestamp','$REMOTE_ADDR','$PHP_SELF')") or die("Error2");
mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout") or die("Useronline Database DELETE Error");
$result=mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='$PHP_SELF'") or die("Error3");
$user =mysql_num_rows($result);
mysql_close();
if ($user==1) {echo"$user User online";} else {echo"$user Users online";}
?>
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