What is the purpose of using cache headers in PHP?

Cache headers in PHP are used to control how web browsers and proxy servers cache content from a website. By setting cache headers, you can specify how long a browser should cache a resource before requesting it again from the server. This can help improve website performance by reducing the number of requests made to the server.

// Set cache headers to cache a resource for 1 hour
header("Cache-Control: max-age=3600");