Lost php session in Firefox Android?

Question

PHP

Only Firefox on Android gets an empty session. In any other browsers (and desktop Firefox) sessions work correctly.
The session starts at the very beginning and looks like this:

session_start();
session_set_cookie_params(2592000, '/', '.' . $_SERVER['HTTP_HOST']);
setcookie('PHPSESSID', session_id(), time() + 2592000, '/', '.' . $_SERVER['HTTP_HOST']);
session_regenerate_id(true);

The cookie has a PHPSESSID.

Answer 1

Problem solved. I should have read the documentation for more details. The problem was session_regenerate_id. It says:
After disconnection, sessions work correctly everywhere, but this lowers security.