[GIT-PULLS] [php-src] PR #23297: session: fix some expectations for C session handlers

[email protected] (Girgias)
Newsgroups php.git-pulls
Message-ID <[email protected]> 
Pull Request: https://github.com/php/php-src/pull/23297
Author: Girgias

We *explicitly* say that mod_data will be not NULL for create_sid hooks and we violate this invariant if SessionHandler::open() is overwridden without calling the parent method.

At the same time add comments explaining the situation and fix some other potential footguns.
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