Go to page does not work

[vigour]

I have a page with links so I can go to next, previous, first and last page. The page number is located in the variable $pageno

// 1. Obtain the required page number
if (isset($_GET['pageno']))
	{
	$pageno = $_GET['pageno'];
	}
else
	{
	$pageno = 1;
	}

For example, this is the next link:

echo " <a href='{$_SERVER['PHP_SELF']}?pageno=$nextpage'>></a> ";

The user can input a page number in a textfield and then click a button to go to that page. This will call another php page with the following code.

// get user input
$new_page = $_POST["new_page"];
$pageno = $new_page;
include ("show_search_result.php");

But this will not work. I will still get the same page. So my question is: How do I solve this?

[Piranha]

There are two easy ways to do this. The first is to set the form action to GET and use the same code to pick up the page number. The second is to check both GET and POST as below.

if (isset($_GET['pageno']))
    {
    $pageno = $_GET['pageno'];
    }
elseif (isset($_POST['pageno']))
{
$pageno = $_POST['pageno'];
}
else
    {
    $pageno = 1;
    }

You might want to check that a valid page number have been inserted to be sure that the user won't insert something else. What happens for example if the user inputs "eight" "all" or "1.3"? [man]is_int[/man] will probably help you solve these kind of problems.