[PHP] Form handling

[dan]

Hello, all -
I've been researching how to handle forms properly, and I think I 
figured out a way that might be beneficial for me to use.  It is as follows:

(index.php)
session_start();
if (isset($_SESSION['step'])) {
        switch $_SESSION['step'] {
                case "1":
                        require('step1.php');
                        break;
                case "2":
                        require('step2.php');
                        break;
                case "3":
                        require('step3.php');
                        break;
                // add more case statements here if I need to
                default:
                        require('step1.php');
                        break;
        }
} else {
        $_SESSION['step'] = '1';
        require('step1.php');
}
Each stepX.php file would look something similar to this:
(step1.php)
// if submitted, check data for completeness
// if complete, set 'step' to 2, to be used as argument to index.php
        $_SESSION['step'] = '2'
// redirect back to index.php, use new value of 'step' to direct
        header('Location: http://somesite.com/index.php');
// else display form data

Now, this is, really, one of my first experiences with doing forms.  I 
just want to know if I can/should/would anticipate any problems down the 
road while doing this.  I think it would work quite well, but I've only 
been doing this for a short while.

Thanks!
-dant
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