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

You can use is_home() or is_front_page() function to redirect your home page.

Answer 2

You can use a Wordpress function to detect if you're on the home page:

is_home

http://codex.wordpress.org/Function_Reference/is_home

<?php
if ( is_home() ) {
    // This is a homepage - 301 Redirect
    header("HTTP/1.1 301 Moved Permanently"); 
    header("Location: http://www.example.com/np");
    exit;
} else {
    // This is not a homepage
}
?>