[PHP] OOP design question

[Mike Smith]

I am starting to get a handle (I think) on OOP. I was wondering if 
anyone would care to comment on what I think I understand:

For simplicity's sake class.php contains AddItem() and DisplayItems(). 
Since submitting form data

<?php
include('class.php');
If(!$_POST['submit']){ //Do I need to instantiate(?) $po everytime the 
page reloads?
$po = new PO;
}

If($_POST['submit']){
$po->AddItem();
}
<form action="$PHP_SELF" method="POST" >
...form fields and a submit button...
</form>
$po->DisplayItems();

?>

Is this a good basic methodology (aside from checking the form fields 
for valid characters).

Thanks,
Mike Smith
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