Rather than working around the problem (ie, finding a new way to redirect) why not solve the initial problem and be done with it? Sending out headers should never, ever, come after any content has been sent out. Re-structure your PHP code so that the redirect can happen before anything is outputted and bam, no need to bother with resorting to HTML/JavaScript/ask-them-politely redirects.

Also -- a minor point in the grand scheme of things -- is that the value in the Location header should be a full URL: http://domain.com and all the rest. It will work with just index.php... but just because something works, doesn't make it right.