How to redirect php referral link?

Question

PHP

There are a lot of links with different i at the end https://test.ru/?i=717956 https://test.ru/?i=123 https://test.ru/?i=1234
How to redirect them to the site https://dom.com/?i=717956 https://dom.com/?i=123 https://dom.com/?i=1234

Do not redirect https://test.ru/

Answer 1

if ($i = filter_input(INPUT_GET, 'i', FILTER_VALIDATE_INT)) {
    header('location:  https://dom.com/?i=' . $i);
    exit();
}

Answer 2

If using .htaccess, judging by the tag, then something like this:

RewriteEngine On
RewriteCond %{QUERY_STRING} ^i=\d+$
RewriteRule ^$ https://dom.com/ [R=301,L,QSA]

Answer 3

index.php-

<?php
echo file_get_contents('https://dom.com/?i='.$_GET['i']);
?>

Why not? :D