Redirect only WordPress homepage with a 301 redirect

Question

I have a blog, lets say example.com and another blog installed in example.com/np which is not multisite but a different WordPress installation.

Answer 1

Put the following in your functions.php file:

add_action( 'get_header', 'so16738311_redirect', 0 );
function so16738311_redirect()
{
    if( is_home() || is_front_page() ) {
        wp_redirect( home_url( '/np/' ), 301 );
        exit;
    }
}