Redirect user to the last page on my pagination

Question

I know this sounds confusing: I have just built some basic prev/next pagination for mysql and i wanted to know, if the last page of my rows is .php?page=5 and someone puts .php?page=263 then i want to redirect them to .php?page=5

Any ideas on how to do this.. the info i currently have is, how many rows are returned after the LIMIT so if it was .php?page=263 then it would be 0 I also have the total number of rows in my database... the LIMIT is 10 :)

Thanks in advance!!

Answer 1

If you already have the total number of rows, and you know how many rows you will be displaying per page, then you can calculate the last page like so:

$totalPages = ceil( $rows / $perPage );

Then, simply restrict the current page to a reasonable limit:

$page = isset( $_GET['page'] ) ? (int) $_GET['page'] : 1;
$page = min( max( $page, 1 ), $totalPages );

Answer 2

The easiest thing to do is define some form of $max_page_number variable, then check that the page entered $_GET['page'] is either less than the maximum possible number, or, if not, compensate for that and redirect to the last page:

$max_page_number = 10; // or whatever the maximum/last page number is, $page_requested = $_GET['page'];

if ($page_requested <= $max_page_number) {

// show the page requested by the user
}

elseif ($page_requested > $max_page_number) {

// redirect to the relevant page

}

else {

// redirect to the splash page, or first page

}

it's also worth suggesting that you should check people can't enter index.php?page=-10 without it being caught, so you should really check for numbers less than the first page and greater than your last page.