PHP - Difference between session_cache_limiter() and headers?

Question

I was wondering, if there is any difference between them:

session_cache_limiter('nocache');

and headers:

header("Cache-Control:no-store,no-cache,must-revalidate,max-age=0");
header("Cache-Control:post-check=0,pre-check=0",false);
header("Pragma:no-cache");

Assuming that I don't want any cache.

Answer 1

For all who wandered here from google search and feel lost ...

Call session_cache_limiter before session_start if you use session.

Send headers directly, if you don't use session, because session_cache_limiter only works in combination with session_start.