Are there any best practices for indicating the language or location of a website to search engines using PHP headers?

To indicate the language or location of a website to search engines using PHP headers, you can use the "Content-Language" and "Content-Location" headers. These headers can help search engines understand the language and location of your website, which can improve its visibility in search results.

header('Content-Language: en-US');
header('Content-Location: https://www.example.com/en-US/');