function User_Ajax()
{
    global $DBH;
    if (isset($_GET['q'])) {
        //$data = array('req' => $_GET['q']);
        $RESULT = $DBH->prepare("SELECT * FROM " . DB_PREFIX . "user WHERE `l_name` like '%" . $_GET['q'] . "%' OR `f_name` like '%" . $_GET['q'] . "%'");
        $RESULT->execute();
        $RESULT->setFetchMode(PDO::FETCH_ASSOC);
        while ($row = $RESULT->fetch())
            $a[] = $row['f_name'] . ' ' . $row['l_name'];
    }
    echo json_encode($a);
}