You can write HTML on PHP pages. You could either end your PHP (?>) and write your HTML and then start PHP again (<?php) or you could write HTML directly in echo's.
echo "<b>HTML here</b><br />";
echo "<a href=\"http://www.google.com\">Google!</a>"; // You have to escape the double quotes, though, by adding a back slash.
And if you want to redirect the user to another page, you can use META tags or the header(); function.
You might want to add ob_start(); at the top too, that way it worked for me.