Upgrade to PHP 7.2 causes session_cache_limiter error

[Nuwanda]

This code has been working fine on PHP versions 5.6, 7.0, 7.1:

session_start();

$f3 = Base::instance();

Just upgraded to the newly stable PHPv7.2, and it throws the error:

Internal Server Error

session_cache_limiter(): Cannot change cache limiter when session is active

If I reverse the session call thus:

$f3 = Base::instance();

session_start();



It works fine again. I should be able to call session_start before assigning F3.

base.php has a call to session_cache_limiter('') on line 2257

F3 version 3.6.2-Release

[bcosca]

Why would you want to start a session before the browser is informed about how it should name a session or how long it should persist a session? Or would you rather blindly trust any server to have the same configuration?

[Nuwanda]

The code worked fine in the last three versions of PHP before 7.2.

Why did it work previously and now it doesn't? That's what I'm asking.

[bcosca]

Just because you could get away with it before doesn't mean it's legal :)

[Nuwanda]

I've seen plenty of code that starts a session before calling F3. It was a genuine question, and I think it's a fair one. Considering you're the developer of F3, that's a pretty flippant answer.

[bcosca]

What do you propose? A solution that fits your use case but affects performance of apps of everyone else? Checking session state every time the framework is invoked is expensive, moreso if you create a session for all users - logged in or otherwise. Besides, not all apps require a session. Perhaps you should review your process and ask yourself (1) is it necessary to create a session on all routes/pages of your site, and more importantly (2) why override/preempt the framework with a session?

I haven't probably grasped your rationale for a session_start(), so I'm working on the analogy that you insist on some element styling yet you want that style to survive a CSS reset.