GET variables and links

[mPeror]

I ran into this serious problem while developing a site.

say i use 3 GET variables in my URL when people navigate through my site's pages : 1) section 2) postsperpage 3) page

and almost each section has multiple pages of links with page numbers to click on (PHP paging). Also , the 'section' and the 'postsperpage' variable might be both set or not. Or maybe just one of them is set.

Now how do i form the links for pages numbers according to which variables are set? For example , the same link could be :

http://.../script.php?page=1

or

http://.../script.php?section=1&page=1

or

http://.../script.php?section&=1&postsperpage=10

and so on


how shall i do it?


Thanks for your time

[Dylan B]

Several "if (isset($_GET['var1'])){" type things?

Make sure also, to validate your get input.

[subduck]

Make sure also, to validate your get input.

That's very important, check to make sure if the variables are set and then check if they are valid.

[mPeror]

so shall i do something like this? :

<?php
$link = "script.php?";

if(isset($_GET['section']))
{
   // validate then ..
   $link .= 'section=' . $_GET['section'] . '&';
}

if(isset($_GET['postperpage']))
{
   // validate then ..
   $link .= 'postperpage=' . $_GET['postperpage'] . '&';
}

echo '<a href="'. $link .'" >click me</a>';

?>

or is there something better than using many IF statements?

[mwolfe]

well its not good to clutter a users system with cookies but sometimes it helped simplify the logic on my site quite a bit to store the results per page in a cookie so i wouldnt have to keep appending it in the querystring..

as to your previous post.. it looks fine.. you could also do a switch i believe for that but i'm not sure how to run a switch on a get array, or something like that..

[Dylan B]

What you'll need to do is create an array for each get variable with the values you want to accept.

So like

$sections = array('section1', 'section2', 'section3');
if (isset($_GET['sections']))
{
if (in_array(&_GET['sections'], $sections))
{
// do stuff
}
else
{
die('Hacking attempt!');
}} 

Something along those lines.

[mPeror]

Ok that cleared things up. Thanks alot guys

[Dylan B]

No problem.