sorbetcms/admin/ajax.php

<?php
if (!defined('entry')) {
    define('entry', true);
}
/* ===========================

  Sorbet CMS - A PHP based tumblelog CMS forked from Gelato CMS

  Sorbet CMS is a free software licensed under the GPL 3.0

  =========================== */
?>
<?php
    require_once('../entry.php');
    global $user;

    if ($user->isAdmin()) {
        if ($_GET["action"]) {
            if ($_GET["action"] == "close") {
                if ($user->closeSession()) {
                    echo __("&nbsp;ending session&hellip;");
                } else {
                    echo __("&nbsp;failure ending session&hellip;");
                }
            }    // $_GET["action"] == "close"

            if ($_GET["action"] == "verify") {
                if ($_GET["login"]=="") {
                    echo "<div class=\"error\">".__("Required field cannot be left blank.")."</div>";
                } else {
                    if (!$user->userExist($_GET["login"])) {
                        echo "<div class=\"exito\">".__("Username available.")."</div>";
                    } else {
                        echo "<div class=\"error\">".__("The username is not available.")."</div>";
                    }
                }
            }    // $_GET["action"] == "verify"
        }    // $_GET["action"]
    }    // $user->isAdmin()