php redirect with HTTP query string variables

atm I'm using the following four lines to redirect the user to another page on my website:

<?php
    header("Status: 301 Moved Permanently");
    header("Location: ./content/index.html");
    exit;
?>

but there is a problem with the use of HTTP query string variables like http://< url >?param=blah
they don't get appended to url understandably.

Is there a smart move for implementing this?

greetings