I recently had an issue where I wanted a PHP contact form to redirect to a thank you page after the headers had already been sent. If you think outside of the PHP box, there is a very simple way to make this work using Javascript. Just add this bit of code to the bottom of the page:
<?php
printf(“<script>location.href=’http://www.usdamortgagegroup.com/thank-you/368/'</script>”);
?>