title: Posted form data remains in memory
body: <p>My modal has a simple form in it and the form post data to <code>process.php</code> page. The <code>$_POST['message']</code> and other posted data will be process inside <code>process.php</code>, however the value of <code>$_POST['message']</code> and other posted data's values remains on the page. Means, when I <code>echo $_POST['message']</code> inside <code>process.php</code> and refresh the page, the value keeps showing up! 
  in which the <code>process.php</code> runs its things again and I don't want that!
  I am not sure where the session comes from or this cause by cookie but I don't want that. I want that the posted data will be removed after processing inside <code>process.php</code> page.
  How can I fix this?</p>