How can one effectively use keywords with the header() function in PHP?

When using the header() function in PHP, you can effectively use keywords by setting the appropriate HTTP header status codes for search engine optimization (SEO) purposes. For example, you can use the 301 status code for permanent redirects or the 404 status code for not found pages. This can help search engines understand the content and structure of your website better.

// Set a 301 redirect header
header("HTTP/1.1 301 Moved Permanently");
header("Location: https://www.example.com/new-page");
exit();