Limit Direct Access .. ?

I have made a form that whenever the user completes the registration successfully, it redirects him/her to a new page (thankyou.php) saying "thank you for registering, bla bla....". It works fine but I want to prevent the direct access to thankyou.php so if the user types "www.mysite.com/thabkyou.php/" it redirects him to the form without displaying the thank you message. But in case the user succeeds to register, thankyou.php opens & displays the thank you message.

Do you have any idea how can I do that ?

 

Set a cookie or a session variable on the form page. Check for the value on the thankyou page.

//Form.php
session_start();
$_SESSION['some_variable'] = true;

//Thankyou.php
If (!$_SESSION['some_variable']){ header("Location: goback.php")};

 

SOLVED..!
Thank you very much. I had to add session_start(); at the beginning of thankyou.php. Very helpful.