Logout of System In PHP

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($_COOKIE[session_name()])) {
setcookie(session_name(), ||, time()-42000, |/|);
}

// Finally, destroy the session.

session_destroy();
header("location:index.php");
?>