Excelent brother!

Thanks Brother ...

superb bro

Nice code!. but when i implemented my website it's automatically logging out even while user is using the system..

I haven't implemented this in my project yet, but this looks perfect for what I was looking for, My suggestion is to redirect the user to the website home page after logging out
after these two lines

session_destroy();
session_unset();

add this line
header('Location: ../index.php');

thank you

It's really helpful.

Thanks! It helps me a lot.

WOW! it's really GREAT!!! Thank you

Question is there a way, force the page to refresh when the time out is reached?
like coding a refresh() method? or does it already exist in php?

If you can use JavaScript that is work.
Like this : setTimeout(function(){ location.reload(); }, 60005); // 60005 milliseconds

Can anyone help me how can I user above code in CodeIgniter?

Not working in codeigniter! "timestamp" is said to be an undefined index.

This is ok...but how to check wheather a user is doing activity...and after then only we will logout the user!!!

Thanks for the snippet! I modified it to work php7

** put this line in your login script - must have already done a session_start() **
$_SESSION['timestamp']=time();

** Load this on every page **
session_start();

$autologout=1800; //after 15 minutes of inactivity the user gets logged out
$lastactive = $_SESSION['timestamp'] ?? 0; // Use of 'Null Coalescing Operator' - pulls the timestamp or sets it to 0.

if (time()-$lastactive>$autologout){
	    $_SESSION = array();                   // Clear the session data
                setcookie(session_name(), false, time()-3600);     // Clear the cookie
               session_destroy();                         // Destroy the session data
}else { 
		$_SESSION['timestamp']=time();              //Or reset the timestamp
	}