Should I document session_get_cookie_params => setcookie?

Hello,

Today I wanted to check from JavaScript whether a session was started but
the system sets the session cookie to httponly so I can't do that so I
wanted to do setcookie('has_session', 1, session_get_cookie_params()). This
of course (?) doesn't work. Should I add a code snippet on how to make it
work to session_get_cookie_params and / or setcookie or should I just
submit to Stackoverflow as a self answer? I already added
https://marc.info/?l=php-doc-cvs&m=159105012229429&w=2 because that's
generic enough. Speaking of, should I amend the return values of setcookie
to include this null or just this commit is enough?

Best,

NK