When you need a list of feed pages

You know…at the bottom of a feed page, the list of how many other older posts they can view if they want

       $categories      = get_term_by('name','news','category');
       $number_in_cat   = $categories->count;
       $num_of_pages    = ceil($number_in_cat/$posts_per_page);
       $offset          = $_GET['offset_news'];
       $current_offset  = 0;
       
       for($c=1;$c<=$num_of_pages;$c++) {
           if (empty($current_offset))  { $current="current_pagenation"; }else{ $current=""; }
           if (!empty($offset)) { if ($current_offset/$offset == 1 ) { $current="current_pagenation"; }else{ $current=""; } }
	       echo "<a href='http://blackburn.edu/news-events?offset_news=$current_offset' class='pagenation $current'>$c</a>";
	       $current_offset = $current_offset + $posts_per_page;
       }