Onlinetid ??

PHP kode 

 <?PHP 
 $sql = mysql_query("SELECT * FROM `users` WHERE `last_online` = 'now'");
 $total = mysql_num_rows($sql);
 echo $total . "online lige nu";
 ?>

PHP kode 

 <?php
 
 $dage     = array("Mandag","Tirsdag","Onsdag","Torsdag","Fredag","Lørdag","Søndag");
 $tider     = array("00:00 - 01:00",
                                 "01:00 - 02:00",
                                 "02:00 - 03:00",
                                 "03:00 - 04:00",
                                 "04:00 - 05:00",
                                 "05:00 - 06:00",
                                 "06:00 - 07:00",
                                 "07:00 - 08:00");
 
 if (isset($_POST["doSubmit"])) {
     foreach ($dage as $dag){
         if(isset($_POST["$dag"])){
             echo $dag . ": <br/>";
             foreach ($_POST["$dag"] as $t=>$v){
                 echo "$v <br />";
             }
         }
     }
 }else{
 
     echo "<form method='post'>";
 
     foreach ($dage as $dag){
         echo $dag . " <br />";
 
         foreach ($tider as $tid){
             $name = $dag . "[]";
             echo "<input type='checkbox' name='$name' value='$tid'>$tid</input></br />";
         }
 
         echo "<br />";
     }
 
     echo "<input type='submit' name='doSubmit' value='Gem' />";
     echo "</form>";
 }
 ?>

Kode 

<?php
session_start();
if (!isset($_SESSION["logon_time"])){
  $_SESSION["logon_time"] = mktime;
}
$tid = (mktime - $_SESSION["logon_time"]);
Echo "online tid:" . $tid . " Sec";
?>