Snippet - Users timeout in Laravel

gistfile1.php

<?php
// If the user isn't logged in, don't do anything, just return
if(!Auth::user()) {
    return false;
}
$now = new DateTime();
$last_activity = Auth::user()->last_activity;
$diff = ( date diff magic )
// Or whatever value in whatever format is needed... like I said, pseudo code
$timeout = "40";
if($diff > $timeout) {
    Auth::logout();
    return Redirect::to('login')->with('timeout','Session timed out, please login again.');
}
// TImeout has not occurred, update last_activity
Auth::user()->last_activity = $now;