WordPress | Redirect pages to the homepage, if the user isn't logged in. Good for maintenance mode.

home-anonymous-redirect.php

<?php

// if it's not the homepage and they aren't logged in, redirect to the home URL
add_action( 'template_redirect', 'fs_maintance_mode' );
function fs_maintance_mode() {
	if ( !is_home() && !is_user_logged_in() ) {
		wp_redirect( esc_url_raw( home_url() ) );
		exit;
	}
}