Sorry, have to study how run tests before pull request...

And try to fix the current one, not to open another :)

Can you explain what is it good for?

Getting "session_regenerate_id(): Session object destruction failed" when calling before session_write_close();
But i can`t call session_write_close(); before session_id().

Is it needed to call session_write_close() when session_id() === '' ?

Or now we can usehttp://php.net/manual/en/function.session-status.php

Getting error when using:

if (session_id() !== '') {        session_regenerate_id(TRUE);}

Everithing fine when using:

if (session_status() === PHP_SESSION_ACTIVE ) {        session_regenerate_id(TRUE);}

IMHO session_write_close(); should be in condition too.

Did you change the order of session_write_close and session_regenerate_id intentionally?

Make no sense for me, where should be session_write_close() "in condition too" ?
After session_regenerate_id(TRUE) it is unnecessary because there is another session_write_close() after condition. But it should be always before $backup = $_SESSION;
Giving session_write_close() before session_regenerate_id(TRUE) is not obviously good idea.

After session_regenerate_id(TRUE) it is unnecessary because there is another session_write_close() after condition

Why must be another after condition? Why call it when session is not active?

Well, thats true, it might not, when seesion status is not active, nothing will be writen to session. I will fix it.

Thanks!

Thanks for nothing, you did the solution. :-)