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<?php
    include('_init.php');

    if (!empty($_GET["langcode"]) && ($_GET["langcode"] == "en" || $_GET["langcode"] == "cn")) {
        $langcode             = $_GET["langcode"];
        $_SESSION["langcode"] = $langcode;

        //echo "<script type='text/javascript'>location.href=document.referrer;</script>";

        if (!empty($_SERVER['HTTP_REFERER']))
            header("Location: " . $_SERVER['HTTP_REFERER']);
        else
            echo "<script type='text/javascript'>history.back();</script>";


        exit;
    } else {
        header("Location: index.php");
    }