<?
session_start();
$session=session_id();
$time=time();
$time_check=$time-600; //SET TIME 10 Minute

$host="localhost"; // Host name
$username="users_camilla"; // Mysql username
$password=""; // Mysql password ER UDFYLDT
$db_name="users_camilla"; // Database name
$tbl_name="user_online"; // Table name

// Connect to server and select databse
mysql_connect("$host", "$username", "$password")or die("cannot connect to server");
mysql_select_db("$db_name")or die("cannot select DB");

$sql="SELECT * FROM $tbl_name WHERE session='$session'";
$result=mysql_query($sql);

$count=mysql_num_rows($result);

if($count=="0"){
$sql1="INSERT INTO $tbl_name(session, time)VALUES('$session', '$time')";
$result1=mysql_query($sql1);
}
else {
"$sql2=UPDATE $tbl_name SET time='$time' WHERE session = '$session'";
$result2=mysql_query($sql2);
}

$sql4="SELECT * FROM $tbl_name";
$result4=mysql_query($sql4);
$count_user_online=mysql_num_rows($result4);
echo "Brugere online: $count_user_online";

// if over 10 minute, delete session
$sql5="DELETE FROM $tbl_name WHERE time<$time_check";
$result5=mysql_query($sql5);

mysql_close();

// Open multiple browser page for result
?>