page numbering

<?php
    //$row['guide'] = "aaaaaaaaaaaaaaaaaaaaaaaaaaaa#PAGE_BREAK#bbbbbbbbbbbbbbbbbbbbbbbbb#PAGE_BREAK#ccccccccccccccccccccccccccc";
    //$_GET['page']=2;

    /* visa sidan */
    $pages = explode('#PAGE_BREAK#',$row['guide']);

    /* fetch the page nr from the url */
    $page_nr = (int) $_GET['page'];

    /* lägsta tillåtna är 1 */
    $page_nr = max(1, $page_nr);

    /* högsta är samma som antal sidor */
    $page_nr = min($page_nr, count($pages));

    /* finns det mer än 1 sida? */
    if(count($pages) > 1)
    {
        /* Make a list whit links for all pages */
        $page_links = array();
        foreach(range(1, count($pages)) as $page_link_nr)
        {
            $page_links[$page_link_nr] = "<a href='?page={$page_link_nr}'>{$page_link_nr}</a> ";
        }

        /* replace the link for the current page */
        $page_links[$page_nr] = "<b>{$page_nr}</b>";

        /* print all links whit | between */
        echo implode(" | ", $page_links);
    }

    /* echo the page */
    echo $pages[$page_nr-1];
?>