function get_examples($con, $args)
{
    $examples = array();
    if (isset($args["eid"])) {
        $eid = $args["eid"];
        $sql = $con->prepare("SELECT section_id,ename,`order` FROM example WHERE eid=?");
        $sql->bind_param("i", $eid);
        $sql->bind_result($section_id, $ename, $order);
        $sql->execute();
        $sql->fetch();
        $sql->close();
        if (isset($section_id) && isset($ename) && isset($order)) {
            $tmp = new Example();
            $tmp->populate($eid, $section_id, $ename, $order);
            $examples[] = $tmp->expose();
        }
    } else {
        if (isset($args["ename"])) {
            $ename = $args["ename"];
            $sql = $con->prepare("SELECT eid,section_id,`order` FROM example WHERE ename=?");
            $sql->bind_param("s", $ename);
            $sql->bind_result($eid, $section_id, $order);
            $sql->execute();
            while ($sql->fetch()) {
                if (isset($eid) && isset($section_id) && isset($order)) {
                    $tmp = new Example();
                    $tmp->populate($eid, $section_id, $ename, $order);
                    $examples[] = $tmp->expose();
                }
            }
            $sql->close();
        } else {
            $sql = $con->prepare("SELECT eid,ename,section_id,`order` FROM example");
            $sql->bind_result($eid, $ename, $section_id, $order);
            $sql->execute();
            while ($sql->fetch()) {
                if (isset($eid) && isset($ename) && isset($section_id) && isset($order)) {
                    $tmp = new Example();
                    $tmp->populate($eid, $section_id, $ename, $order);
                    $examples[] = $tmp->expose();
                }
            }
            $sql->close();
        }
    }
    return $examples;
}