301 Moved Permanently via WordPress Child Theme functions.php

functions.php

<?php
function redirect_to_url() {

	switch ( $_SERVER['REQUEST_URI'] ) {
		case '/an-old-uri/':
			$redirect_to = '/the-new-uri/';
			break;
		case '/another-old-uri/':
			$redirect_to = '/another-new-uri/';
			break;
		default:
			$redirect_to = false;
	}

	if ( $redirect_to && ! is_user_logged_in() ) {
  		if ( wp_safe_redirect( $redirect_to, 301 ) ) { exit; }
  	}
}
add_action( 'template_redirect', 'redirect_to_url' );