Hard Refresh (F5) on the parent page when in the iframe through PHP

Question

I am trying to instigate a hard refresh (F5) on the parent page but since I am working within an iframe, I am unable to do so.

I tried all of these following but either the refresh happens within the frame or complete page refresh isn't achieved.

JS within PHP

echo ("<SCRIPT LANGUAGE='JavaScript'>
                parent.window.location.href='".$my_url."';
</SCRIPT>");

echo ("<SCRIPT LANGUAGE='JavaScript'>
                parent.window.top.location.href ='".$my_url."';
                </SCRIPT>");
exit();

PHP Refresh

  Header('Location: '.$my_url);

Nothing is working.

The reason I am hoping to achieve this because some of the elements in the page will only be re-activated when the page refreshes completely.

Hopefully, there is some way through which we can have a complete refresh through PHP.