How to avoid resending data on refresh in php

Question

I have a page \"index.php\" where i have a link called \"add_users.php\". In \"add_users.php\", I accept user information and come back to the same page \"index.php\" where

Answer 1

Same challenge I faced using a comment box, what I did is to redirect the page to the same page and to an specific "anchor". Example:

Then for the PHP code I have:

This avoid the F5 resend of the data from the Form