Ubercms code to Revcms

[vaulient2]

Hey guys , So I found this code on a forum , it's for ubercms , it's a news comment system with pagination, but Idk how to conver it to work with Revcms. Here are the codes

$getComments = mysql_query("SELECT * FROM site_news_comments WHERE article = '".$news_article_id."' ORDER by id DESC");

$getComments = dbquery("SELECT * FROM site_news_comments WHERE article='" . $articleid . "'"); // Find all comments 
    $count = mysql_num_rows(getComments); // Results 
    $pages = ceil($count / 5); // Calculate pages 
    $offset = $page - 1;          // 
    $offset = $offset * 5;      // Comments per page 
    $getComments = dbquery("SELECT * FROM site_news_comments WHERE article = '" . $articleid . "' ORDER BY id ASC LIMIT 5 OFFSET " . $offset);

if ($page == 1) 
            { 
                echo "First  "; 
            } 
             
            else 
            { 
                echo "<a href='articles?id=" . $articleid . "&page=" . 1 . "'>First</a>&nbsp;&nbsp;"; 
            } 
 
for ($i = 1; $i <= $pages; $i++) 
        { 
            if (($page + 4) >= $i && ($page - 4) <= $i) 
            { 
                if ($i != $page) 
                { 
                    echo'<a name="pages" href="' . WWW . '/articles?id=' . $articleid . '&page='.$i.'">'.$i.'</a>&nbsp;&nbsp;'; 
                } 
                else  
                {  
                    echo "<b>" . $i . "</b>&nbsp;&nbsp;";  
                }  
            } 
        } 
            if ($page == $pages) 
            { 
                echo "Last"; 
            } 
             
            else 
            { 
                echo "<a href='article.php?id=" . $articleid . "&page=" . $pages . "'>Last</a>"; 
            }

I would love it if you would explain the concept of this code aswell , I'm trying to learn all this