// Remove www if ($_SERVER['HTTP_HOST'] == 'www.example.com') { header('HTTP/1.0 301 Moved Permanently'); header('Location: http://example.com'. $_SERVER['REQUEST_URI']); exit(); }
// Require www if ($_SERVER['HTTP_HOST'] == 'example.com') { header('HTTP/1.0 301 Moved Permanently'); header('Location: http://www.example.com'. $_SERVER['REQUEST_URI']); exit(); }