Need help on Pagination (First | Prev | Next | Last)

[jfernandez]

Hi,

I have a function which currently does the pagination for me. It prints "First | Prev | Next | Last" in my page and works fine if the query string has "page=1". For example, if a certain page is http://www.mydomain.com?page=2, then click the Next link will bring the browser to http://www.mydomain.com?page=3. But it doesn't work if my query string has multiple variables, like http://www.mydomain.com?page=4&sort=name&lang=en. Can someone with more experience tell me a solution? I would be very appreciated. I've attached the function I have.

Sorry the posting doesn't allow me to properly indent.

function prevnext($page, $num_page, $get_string = "")
{
if($page == 1)
{
echo 'First | Prev | ';
}
else
{
echo '<a title="First" href="'.$SERVER["PHP_SELF"].'?page=1'.$get_string.'">First</a> | ';
$prev_page = $page - 1;
echo '<a title="Previous Page" href="'.$SERVER["PHP_SELF"].'?page='.$prev_page.''.$get_string.'">Prev</a> | ';
}

if($page == $num_page)
{
    echo 'Next | Last';
}
else
{
    $next_page= $page + 1;
    echo '<a title="Next Page" href="'.$_SERVER["PHP_SELF"].'?page='.$next_page.''.$get_string.'">Next</a>';
    echo ' | <a title="Last" href="'.$_SERVER["PHP_SELF"].'?page='.$num_page.''.$get_string.'">Last</a>';
}

}

[sfullman]

dont' think anyone could figure out from your function - we don't know what $get_string is. Seems like you may be winding up with something like:

page.php?page=5&original=here&more=here&etc=here&page=4

which php would see as page = 4, NOT 5. Check for redundant vars in the query string you're developing.

You know there's a neat variable called $GLOBALS['QUERY_STRING'] you can use

[Weedpacket]

jfernandez wrote:

Sorry the posting doesn't allow me to properly indent.

It does if you put your code between &#91;php]...[/code] tags. It will even colour it for you if you do that (as you'd have seen from many of the other threads in these forums).

If you've got no control over which query string variables appear and in which order, then you might be better of constructing the entire query. PHP5 has [man]http_build_query[/man], but it's easy enough to do by hand. Something like

function build_query($names_and_values)
{
	$querystring_items = array();
	foreach($names_and_values as $name=>$value)
	{
		$querystring_items = $name."=".urlencode($value);
	}
	return join("&", $querystring_items);
}


$querystring = build_query(array(
	'page'=>$page,
	'sort'=>$_GET['sort'],
	'lang'=>'en'
);

(See?)

[jfernandez]

Thanks for the reply. My code is a bit comfusing, that get_string variable shouldn't be there. It doesn't do anything. I only use the first 2 params.

Thanks for Weedpacket's code. I think that's what I want, although I need to try it out at home later today. I need to update the page=x and keep all the other variables intact in the query string. That's the idea behind my question.