PHP Example
Screen shot
Matain session for 2 min

<?php
session_start();

if(isset($_REQUEST['session_expire']) && $_REQUEST['session_expire']=='yes'){
echo "You session is now expire and your session timing is 2 min";
}

$_SESSION['username']='shishir012010';
$_SESSION['time']=time();
?>

Display session value and expire session value

<?php
session_start();
$exact_time=time()-$_SESSION['time'];
if($exact_time>120)
{
unset($_SESSION['username']);
unset($_SESSION['time']);
header("Location:test2.php?session_expire=yes");
}
else
{
echo $_SESSION['username'];
}
?>

You can download source code here