$user_id = ( isset( $_REQUEST['user_id'] ) ) ? $_REQUEST['user_id'] : '';
$orderby = ( isset( $_REQUEST['orderby'] ) ) ? $_REQUEST['orderby'] : '';
$user_id = ( isset( $_REQUEST['user_id'] ) ) ? $_REQUEST['user_id'] : '';
$orderby = ( isset( $_REQUEST['orderby'] ) ) ? $_REQUEST['orderby'] : '';