[php] 301 or 302 Redirection With PHP

I'm considering using the following code during a website launch phase to show users a down for maintenance page while showing me the rest of the site.

Is there a way to show the correct 302 re-direction status to search engines or should I look for another .htaccess based approach?

$visitor = $_SERVER['REMOTE_ADDR'];
if (preg_match("/192.168.0.1/",$visitor)) {
    header('Location: http://www.yoursite.com/thank-you.html');
} else {
    header('Location: http://www.yoursite.com/home-page.html');
};