PHP Open Web Page

PHP Open Web Page

I have a mobile app where I need to verify a successful registration. The
user goes through the registration process. If everything is successful, I
send them an email with a link to a php page. This is just intended to
make sure that a human has initiated the registration process.
All I really want to do with this script is to record that the user is
confirmed, and then show them a web page to give them feedback that they
are successfully registered. It's this very last thing that I am stuck on.
Here's the essence of the process:
Email Content:
Click here to confirm registration: http://mysite.com/confirm_me.php
After they click on that, this script runs:
confirm_me.php
<?php
//capture some stuff in the database
//open a confirmation page
echo "<a href='http://www.mysite.com/you_are_confirmed.html'></a>";
?>
But this last line doesn't do anything. How can I show this page to the
user? Thanks!