I wrote function for short url. Maybe it will be helpful for someone:
function short_url(){
global $post;
if (preg_match('/^http:\/\/example.com\/page\/[0-9]{1,4}$/', "http://".$_SERVER["HTTP_HOST"] . $_SERVER["REQUEST_URI"]))
{
$my_id = intval(preg_replace('/[^0-9]+/', '', $_SERVER["REQUEST_URI"]), 10);
global $wpdb;
$myquery = $wpdb->get_row($wpdb->prepare("SELECT * FROM wp_mytable WHERE ID=%d", $my_id));
$short_url="http://example.com/?page_id=".$myquery->page_id."&user_id=".$myqery->user_id;
wp_redirect($short_url);
exit();
}
}
add_action( 'template_redirect', 'short_url' );