Convert all link my site url. SEO. Hide backlink

Question

Mask all external links to internal, or to hide them. Your own posts, comments pages, authors pages. How i redirect all link my site go to https://surak.szh.kz/go.php

How i add my site example link:

<a href="https://surak.szh.kz/go.php?url=https://google.com">Google</a>

Its nice work, php code:

<?php
    if (isset($_GET['url'])){
         header('HTTP/1.1 200 OK');
         header('Location: '.$_GET['url']);
         exit();
    }
?>

Now how i add search in question, answer and comment text link find and convert link https://surak.szh.kz/go.php?url=

Help please.