php and mysql send user to logout on time

Question

When users login their online status is set to 1 when they logout its set back to 0, im trying to make it so after a certain amount of time of inactivity on the site they will be sent to logout.php, so I setup a field in my users table as last_activity as a timestamp. and have this code as a include on each page.

<?php
if (!isset($_SESSION['last_activity'])) {
    // initiate value
    $_SESSION['last_activity'] = time();
}
if (time() - $_SESSION['last_activity'] > 500) {
    // last activity is longer then certain amount of time
    header('Location: logout.php');
} else {
    // update last activity timestamp
    $_SESSION['last_activity'] = time();
}
?>

But right now as I have it, the last_activity field only updates when something on the users account is updated, also after the certain amount of time the user isn't logged out and I don't know why.

Well as i can see your solution is wrong if i go for a tea and come back more than 500 units of time, you redirect me to logout. Try use cron for checking last activity — kirugan
– kirugan, Commented Jan 6, 2013 at 1:01
anyway, even I support @kirugan. still I have a question, is this your hole checking code. or the previous blocks are inside some functions and you are simplifying your code for the question? — mamdouh alramadan
– mamdouh alramadan, Commented Jan 6, 2013 at 1:03
I just used 500 so it was a quick amount of time ,to test if its working the real amount of time I use will be higher. @mamdouh this is the whole code thats supposed to updated the timestamp check the timestamp and if its been certain amount of time send you to logout. — Nick
– Nick, Commented Jan 6, 2013 at 1:03

hd1 · Accepted Answer · 2013-01-06 01:05:28Z

4

From automatic logout after 15 minutes of inactivity:

<?php
session_start();
$timeout = 10; // Set timeout minutes
$logout_redirect_url = "index.php"; // Set logout URL

$timeout = $timeout * 60; // Converts minutes to seconds
if (isset($_SESSION['start_time'])) {
    $elapsed_time = time() - $_SESSION['start_time'];
    if ($elapsed_time >= $timeout) {
        session_destroy();
        header("Location: $logout_redirect_url");
    }
}
$_SESSION['start_time'] = time();
?>

answered Jan 6, 2013 at 1:05

hd1

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Comments

Ryan Kelley · Accepted Answer · 2013-01-06 01:16:19Z

0

Your code is right just at the top of the file you have to start the session with session_start()

answered Jan 6, 2013 at 1:16

Ryan Kelley

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