set maximum pagination links - php

Question

I have a large database which can yield thousands of results and I need to limit the amount of pagination links of say 9 links, with previous 4 pages on one side then the current page then the 4 next pages.
for example: 14|15|16|17|18|19|20|21|22
anyone know how I could achieve this? Thanks
if (isset($_GET["page"]))
{
$page = $_GET["page"];
}
else
{
$page=1;
};
$start_from = ($page-1) * 10;
$message = "SELECT * FROM document WHERE email='$_SESSION[email]' ORDER BY id DESC LIMIT $start_from , 10";
// echo results
// make page links for results
$sql = "SELECT id FROM document WHERE email = '$_SESSION[email]'";
$rs_result = $db->query($sql);
$total_records = $rs_result->num_rows;
$total_pages = ceil($total_records / 10);
if($rs_result->num_rows >10) {
$page = "<p class = 'page'>";
for ($i=1; $i<=$total_pages; $i++)
{
$page .="<a href='results.html?page=".$i."'>".$i."</a> ";
}
$page .="</p>";
echo $page;
}

Answer 1

Just use basic math to calculate the start and end pages for use in your loop:
$page_range_offset = 4;
$page_start = $page - $page_range_offset;
if ($page_start < 1) {
$page_start = 1;
}
$page_end = $page + $page_range_offset;
if ($page_end > $total_pages) {
$page_end = $total_pages;
}
for ($i=$page_start; $i<=$page_end; $i++) {
$page .="<a href='results.html?page=".$i."'>".$i."</a> ";
}