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language: PHP
licence: WA

unset session (logout)

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<?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 (isset($_SESSION['username'])) {
    setcookie(session_name(), '', time()-42000, '/');
}

// Finally, destroy the session.
(Continues...)