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Date: Fri, 28 Jul 2017 13:48:48 +0100
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To: internals@lists.php.net,"lists@rhsoft.net" <lists@rhsoft.net>,Mailing-List php <internals@lists.php.net>
Message-ID: <28093140-0D0D-4157-AAA3-E8F1A570E67A@gmail.com>
Subject: Re: [PHP-DEV] session_start() should not reset $_SESSIOn if it's not empty
From: rowan.collins@gmail.com (Rowan Collins)

On 27 July 2017 18:03:23 BST, "lists@rhsoft=2Enet" <lists@rhsoft=2Enet> wro=
te:
>if that could work in the way that session_start() keeps the current=20
>state of $_SESSION if not empty it would be possible to put the=20
>APCU-Read and if exit($apcu_content); before session_start() which
>would=20
>gain another 30% performance

I think that behaviour would confuse more people than it would help=2E If =
anything, it should be an error to access $_ SESSION if no session is curre=
ntly open - if there is no session, the array has no meaning=2E (Arguably, =
all the other superglobals should be read only for the same reason, but tha=
t would be a huge break now=2E)

If I understand you right, the scenario you describe is "I don't want to s=
tart a session yet, but if and when I do, I want to put this data into it"=
=2E It feels like that could be adequately handled in userland with a wrapp=
er object (or global var and functions if you prefer), which reads to and f=
rom $_SESSION when a session is open, but a a holding array when it's not y=
et=2E

Regards,

--=20
Rowan Collins
[IMSoP]