301 is the right number for permanent dynamic redirect

Use a server-side 301 redirect if you need to change the URL of a page as it is shown in search engine results.

This is the best way to ensure that users and search engines are directed to the correct page.

The 301 status code means that a page has permanently moved to a new location.

PHP code in dynamic fashion (dynamically):

header("HTTP/1.1 301 Moved Permanently");
header("Location: https://yourwebsite.com/$dynamicpart/");

301 redirects are particularly useful when:

• You move to a new domain
• People access your site through several different URLs.
• You changed your permalinks in WordPress

The same can be done via .htaccess but I find it easy this way.