PHP “header (location)” inside IFRAME, to load in _top location?

Question

I have a simple form which is inside IFRAME. When user click on SUBMIT, it redirects to a specific page on my server. The function I use for the redirect is

Answer 1

A simple way directly in PHP to redirect the parent page rather than the iframe:

echo "";
die;

The die; isn't necessarily necessary, but it is good "just in case" to prevent the script from continuing any further, for example, if javascript is disabled in the user's browser.