What exactly does the session_cache_limiter() function in PHP do, and how does it impact caching of HTTP headers?

The session_cache_limiter() function in PHP sets the cache limiter for the current session. This function determines how HTTP headers are sent to the client to control caching behavior. By setting the cache limiter appropriately, you can ensure that the session data is not cached by the browser.

// Set the cache limiter to 'nocache' to prevent session data from being cached
session_cache_limiter('nocache');
session_start();