PHP Page Security Help

[aodat2]

I have something which I find quite interesting. Till now I have yet to find any answers or anything which is close or even resembles what I really need.

 

This is basically what I have...

 

Page 1 --> Page 2 --> Page 3 --> Page 4

 

My problem is how do I make it in such a way that someone needs to actually go to Page 1 before going to Page 2, 3 or 4? Is there a way to actually do this? I would appericiate it if someone could help tell me what I could do to get this going.

 

Thank you very much.

[The Little Guy]

A session.

 

if the session for a certain page isn't set, don't allow them on that page, and just redirect them to the page where the session is set.

[wildteen88]

An example:

<?php
session_start();

// set our variables, if they are not set we'll set a defaul value.
$_SESSION['pageN'] = isset($_SESSION['pageN']) ? $_SESSION['pageN'] : 1;
$page              = isset($_GET['page'])      ? $_GET['page']      : 1;

// check to see if the pageN session matches the requested page
if($_SESSION['pageN'] == $page)
{
    $_SESSION['pageN']++;

    echo '<h1>Page' . $page . '</h1>';
}
// page does not match, redirect user
else
{
    unset($_SESSION['pageN']);
    header('Location: test.php');
}

?>
<a href="?page=1">Page 1</a><br />
<a href="?page=2">Page 2</a><br />
<a href="?page=3">Page 3</a><br />
<a href="?page=4">Page 4</a><br />

Try going to 2, 3 or 4 first and you'll go back to 1.

[aodat2]

As much as I would say "yes" to it, I seem to be having some problem with Sessions.

 

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by....

 

Not sure what's wrong at all.

 

In my entire page, I have nothing else other than a few JavaScripts and a Form in HTML. Not even sure what's wrong at all.

 

Can someone help?

[wildteen88]

session_start must be called before any output, eg

 

<?php session_start(); ?>
.... your html ...
<?php

// rest of your PHP

?>
.. more html

 

It cannot be

.... your html ...
<?php
session_start();

// rest of your PHP

?>
.. more html

[The Little Guy]

As much as I would say "yes" to it, I seem to be having some problem with Sessions.

 

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by....

 

Not sure what's wrong at all.

 

In my entire page, I have nothing else other than a few JavaScripts and a Form in HTML. Not even sure what's wrong at all.

 

Can someone help?

 

Second Example on page: http://www.phpfreaks.com/forums/index.php/topic,209860.0.html

[aodat2]

Thanks a lot wildteen88.

 

Got it working now

 

Really appericiate everyone that chipped in to help.

[aodat2]

By the way... since you have already given me an example on what to put in Page 1, what am I suppose to put in Page 2, 3 and 4?

 

Mind helping on that as well?

 

Is your code on pageN suppose to be that as well?

 

Thanks a lot for the help. By the way, I'm seriously a noob on this... never programmed in PHP in my life b4. Haha... LOL.