WWW to non-WWW Redirect with PHP

Question

I want to redirect all www.domain.com requests to domain.com with PHP, basically:

if (substr($_SERVER['SERVER_NAME'], 0, 4) === 'www.') {     header('Location: http://' . substr($_SERVER['SERVER_NAME'], 4)); exit(); } 

However I do want to maintain the requested URL like in SO, for e.g.:

http://www.stackoverflow.com/questions/tagged/php?foo=bar 

Should redirect to:

http://stackoverflow.com/questions/tagged/php?foo=bar 

I don't want to rely on .htaccess solutions, and I'm unsure which $_SERVER vars I'd have to use to make this happen. Also, preserving the HTTPS protocol would be a plus.

How should I do this?

Answer 1

Try this:

if (substr($_SERVER['HTTP_HOST'], 0, 4) === 'www.') {     header('Location: http'.(isset($_SERVER['HTTPS']) && $_SERVER['HTTPS']=='on' ? 's':'').'://' . substr($_SERVER['HTTP_HOST'], 4).$_SERVER['REQUEST_URI']);     exit; }