Sometimes you might want to redirect your visitors to a new URL address. One reason you may want to do this is that the page they are trying to access no longer exists.
There are 3 types of redirection, 301, 302 and 303. ‘Redirection 301’ is for that pages that are moved permanently.
In PHP, we can make a 301 with the following code:
<?php header("HTTP/1.1 301 Moved Permanently"); header("Location: http://www.new-location.com"); exit(); ?>