session_encode() & session_decode()

<?php
    session_start();

    $_SESSION["product_code"] = "2222";
    $_SESSION["logged_in"] = "yes";

    $enc_session = session_encode();

    print "<b>Encoded Session Data:<br/></b>";
    print $enc_session . "<br/><br/>";

    // Changing session values
    $_SESSION['product_code'] = "2000";
    $_SESSION["logged_in"] = "no";

    // printing $_SESSION
    print "<b>SESSION Array:<br/></b>";
    print "<pre>";
    print_r($_SESSION);
    print "</pre>";

    session_decode($enc_session);

    // printing Reloaded $_SESSION
    print "<b>Reloaded SESSION Array:<br/></b>";
    print "<pre>";
    print_r($_SESSION);
    print "</pre>";
?>