How to limit pages shown in pagination script - php

Question

I have a pagination script which I have posted below, the problem is I have alot of data so I end with a huge list of pages, I want to make it show only 10 pages at a time and then maybe the last 2 pages like this:
previous 1 2 3 4 5 6 7 8 9...24 25 next
is there anyway I can change the code to do this. Below is the included pagination script I can include the other part of script if needed.
<?php
//source unknown for logic of showPageNumbers()
//modified by drale.com - 1-19-2010
//added query_string reproduction and divs
//added showNext() and showPrev()
class Pagination
{
function getStartRow($page,$limit)
{
$startrow = $page * $limit - ($limit);
return $startrow;
}
function showPageNumbers($totalrows,$page,$limit)
{
$query_string = $this->queryString();
$pagination_links = null;
/*
* PAGINATION SCRIPT
* seperates the list into pages
*/
$numofpages = $totalrows / $limit;
/* We divide our total amount of rows (for example 102) by the limit (25). This
will yield 4.08, which we can round down to 4. In the next few lines, we'll
create 4 pages, and then check to see if we have extra rows remaining for
a 5th page. */
for ($i = 1; $i <= $numofpages; $i++) {
/* This for loop will add 1 to $i at the end of each pass until $i
is greater than $numofpages (4.08). */
if ($i == $page) {
$pagination_links .= '<div class="page-link"><span>' . $i
. '</span></div> ';
} else {
$pagination_links .= '<div class="page-link"><a href="?page=' . $i
. '&' . $query_string . '">' . $i . '</a></div> ';
}
/* This if statement will not make the current page number available
in link form. It will, however, make all other pages available
in link form. */
} // This ends the for loop
if (($totalrows % $limit) != 0) {
/* The above statement is the key to knowing if there are remainders, and it's
all because of the %. In PHP, C++, and other languages, the % is known as a
Modulus. It returns the remainder after dividing two numbers. If there is no
remainder, it returns zero. In our example, it will return 0.8 */
if ($i == $page) {
$pagination_links .= '<div class="page-link"><span>' . $i
. '</span></div> ';
} else {
$pagination_links .= '<div class="page-link"><a href="?page=' . $i
. '&'.$query_string.'">'.$i.'</a></div> ';
}
/* This is the exact statement that turns pages into link
form that is used above */
} // Ends the if statement
return $pagination_links;
}
//added by drale.com - 1-19-2010
function showNext($totalrows,$page,$limit,$text="next »")
{
$next_link = null;
$numofpages = $totalrows / $limit;
if ($page < $numofpages) {
$page++;
$next_link = '<div class="page-link"><a href="?page=' . $page
. '&'.$query_string.'">' . $text . '</a></div>';
}
return $next_link;
}
function showPrev($totalrows,$page,$limit,$text="« prev")
{
$next_link = null;
$numofpages = $totalrows / $limit;
if ($page > 1) {
$page--;
$prev_link = '<div class="page-link"><a href="?page=' . $page
. '&' . $query_string . '">'.$text.'</a></div>';
}
return $prev_link;
}
function queryString()
{
//matches up to 10 digits in page number
$query_string = eregi_replace("page=[0-9]{0,10}&","",$_SERVER['QUERY_STRING']);
return $query_string;
}
}
?>

Answer 1

Untested, but this should always show pages 1 - 3 and the last 3 pages of the list. Otherwise, it will only ever show the previous 3 pages and the next three pages from the current one you're on. (whenever the amount of pages is greater than 10)
$alwaysShowPages = array(1, 2, 3);
// dynamically add last 3 pages
for ($i = 3; $i >= 0; $i--) {
$alwaysShowPages[] = $numofpages - $i;
}
for ($i = 1; $i <= $numofpages; $i++) {
$showPageLink = true;
if ($numofpages > 10 && !in_array($i, $alwaysShowPages)) {
if (($i < $page && ($page - $i) > 3)
|| ($i > $page && ($i - $page) > 3)
) {
$showPageLink = false;
}
}
if ($showPageLink) {
if ($i == $page) {
$pagination_links .= '<div class="page-link"><span>'.$i.'</span></div> ';
} else {
$pagination_links .= '<div class="page-link">'.$i.'</div> ';
}
}
}

Answer 2

I have a version that does this:
1 | 2 | 3 | 4 | 5 | 6 ... 554 | 555 | 556
1 | 2 | 3 | 4 | 5 | 6 ... 554 | 555 | 556
1 | 2 | 3 ... 278 | 279 | 280 ... 554 | 555 | 556
1 | 2 | 3 ... 415 | 416 | 417 ... 554 | 555 | 556
1 | 2 | 3 | 553 | 554 | 555 | 556
The ... are actually links that go halfway between current page and 1st of the next (or last) group of links.
I made it so the 1st 6 pages always appear if current page is less than 5.
But I made all parameters dynamic, so you can change variables like:
$end_links = 3; // set number of links at each end to always show
$center_links; // number of links including current page to show 'floating' in center
It took me hours to do it, which is pretty sad. Oh well.
Just use arrays a lot, and figure out how to add the right values to it. It's simple math and logic, really.