redirect all .html extensions to .php

Question

I want to update all the pages on a website to use include for the footer and header. So I have to change a lot of .html pages to .php.

So i\'m looking for a way to

Answer 1

If you want an actual HTTP 301 Moved Permanently Redirect

RewriteEngine on
RedirectMatch 301 ^(.*)\.html$ $1.php

or

RewriteEngine on
RewriteCond %{THE_REQUEST} \ /(.+)\.php
RewriteRule ^ /%1.html [L,R=301]