Answers for "session destroy function in php when close browser"

destroy session php

<?php 
 session_start(); // start session
 session_destroy();  // Delete whole session
// OR
unset($_SESSION['username']); // delete any specific session only
?>

Destroy Session PHP

<?php
// Initialize the session.
// If you are using session_name("something"), don't forget it now!
session_start();

// Unset all of the session variables.
$_SESSION = array();

// If it's desired to kill the session, also delete the session cookie.
// Note: This will destroy the session, and not just the session data!
if (ini_get("session.use_cookies")) {
    $params = session_get_cookie_params();
    setcookie(session_name(), '', time() - 42000,
        $params["path"], $params["domain"],
        $params["secure"], $params["httponly"]
    );
}

// Finally, destroy the session.
session_destroy();
?>

php destroy session after some time

<?php
session_start();

// 2 hours in seconds
$inactive = 7200; 

$session_life = time() - $_session['testing'];

if($session_life > $inactive)
{  
 session_destroy(); 
}

$_session['testing']=time();
    
    echo $_SESSION['testing']; //prints NOTHING?
    ?>