First of all, move all your PHP code to the top. Without it, my code below wont work.
To do the redirect, use:
header('Location: http://www.example.com/');
I hope this is helps you.
Thank you.

First of all, move all your PHP code to the top. Without it, my code below wont work.
To do the redirect, use:
header('Location: http://www.example.com/');
Also, please consider my advice. Since it's not the first question today and all your questions are related to basics, you should consider reading some good PHP book to understand how things work.
Here you can find useful links to free books: https://stackoverflow.com/tags/php/info