<?php
    /* Start Config */
    $addr = "mysql.hostinger.ru";
    $db = "mysite-local";
    $user = "u547162591_root";
    $password = "35782490";
    $online_time =5;
    /* End Config */
    $ip =$_SERVER["REMOTE_ADDR"];
    $ip = ip2long($ip);
    $date = time ();
    $delete_date = $date - $online_time;
    $mysqli =new mysqli($addr, $user, $password, $db);
    $result_set = $mysqli->query("SELECT 'id' FROM 'online' WHERE 'ip'='$ip'");
    if ($result_set->num_rows != 0) $mysqli->query("UPDATE 'online' SET 'date'='$date' WHERE 'ip'=$ip'");
    else $mysqli->query("INSERT INTO 'online' ('ip', 'date') VALUES ('$ip', $date')");
    $mysqli->query("DELETE FROM 'online' WHERE 'date'<'$delete_date'");
    $result_set = $mysqli->query("SELECT COUNT('*') FROM 'online'");
    $row = $result_set->fetch_assoc();
    $count = $row["COUNT('*')"];
    $mysqli->cloce();
?>

$mysqli =new mysqli($addr, $user, $password, $db);