Постраничный редирект для разных доменов

<?php

$mapping = array(

'/index.php?param1=1&param2=2'=>'/1-param1-2-param2',

'/index.php?param1=2&param2=3'=>'/3-param1-2-param2',

// ...

);

if (isset ($mapping[$_SERVER['REQUEST_URI']])) {

    header("HTTP/1.1 301 Moved Permanently");

    header("Location: http://site.com.ua".$mapping[$_SERVER['REQUEST_URI']]);

    exit();

}