How to expire PHP session after a period of time

Expire the session after some peiod of time by using in php.

Basically, two methods are available to destory the sessions.

   1. session_destroy()
   2. unset($_SESSION['testvaraible'])
   3. setting the time out for this session

 1.session_destroy()

     if we will call the session_destroy(), it will destroy all the SESSION variable.It is no need any other parameters.

<?php
 session_destroy();
?>

2. unset($_SESSION['testvaraible'])

       When we will call the unset() ,it will destroyed the particular variable.
    Example:
   
     

<?php 
 // Destroyed the session variable "testvaraible".
 unset($_SESSION['testvaraible']);

?>

3. setting the time out for this session

<?php

if isset($_SESSION['LAST_MINITUte_ACTIVITY']) && 
(time() - $_SESSION['LAST_MINITUte_ACTIVITY'] > 1800)) {
    // last request was more than 30 minutes ago

    session_unset();     // unset $_SESSION variable for the run-time
    session_destroy();   // destroy session data in storage
}

// update last activity time stamp
$_SESSION['LAST_MINITUte_ACTIVITY'] = time(); 

/*

You can also use an additional time stamp to regenerate the session ID 
periodically,to avoid attacks on sessions like session fixation:

*/

if (!isset($_SESSION['CREATED'])) {
    $_SESSION['CREATED'] = time();

} else if (time() - $_SESSION['CREATED'] > 1800) {

    // session started more than 30 minutes ago
    // change session ID for the current session
    // an invalidate old session ID
    session_regenerate_id(true);    

    $_SESSION['CREATED'] = time();  // update creation time
}

4.session.gc_maxlifetime()

   By using php ini_set session.gc_maxlifetime also we will expire the session.

<?php
 ini_set session.gc_maxlifetime
?>

 
   

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