Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:70128
Mailing-List: contact internals-help@lists.php.net; run by ezmlm
Received-SPF: pass (pb1.pair.com: domain gmail.com designates 209.85.215.49 as permitted sender)
MIME-Version: 1.0
Sender: yohgaki@gmail.com
In-Reply-To: <CAGa2bXZ=jnFpi18ictXiJ1R2MLt--TLEz_p=hymPDMXmFS=CQQ@mail.gmail.com>
References: <CAGa2bXb7hR=jkHnxrBDXnSZkN7B6cDVPj_Nve2=tWS4_AmmOKg@mail.gmail.com>
 <CADajX4CJ061_1b__TAT_6vjNJ9Z+_N6bqN2CA63d+8gvxf4BXQ@mail.gmail.com> <CAGa2bXZ=jnFpi18ictXiJ1R2MLt--TLEz_p=hymPDMXmFS=CQQ@mail.gmail.com>
Date: Fri, 15 Nov 2013 05:57:02 +0900
Message-ID: <CAGa2bXYkoFxWmnhX8ZdD8CKvXucgJQkZgB14pEugxWH4RCeSTg@mail.gmail.com>
To: Adam Harvey <aharvey@php.net>
Cc: "internals@lists.php.net" <internals@lists.php.net>
Content-Type: multipart/alternative; boundary=089e0158b3742fe4e204eb295515
Subject: Re: [PHP-DEV] Session cache, lock and write
From: yohgaki@ohgaki.net (Yasuo Ohgaki)

--089e0158b3742fe4e204eb295515
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

Hi Adam,

On Fri, Nov 15, 2013 at 5:29 AM, Yasuo Ohgaki <yohgaki@ohgaki.net> wrote:

> How do you propose to check if session data was changed? For scalar
>> types it's pretty easy, but it's possible for objects to alter their
>> properties (including the ones they're persisting) on __wakeup() =E2=80=
=94 I
>> presume it would effectively be a comparison of what's about to be
>> written versus what was read initially when it comes time to write the
>> session?
>>
>
> Session data is serialized. If content has changed, the data is changed.
> Session could be large so I'm thinking using md5 hash to save memory.
> Is there any better way?
>

I changed my mind.
Since session data may be cached, it's better to save as it is and compare
byte by byte. Having too large session data is not a good practice anyway.

Regards,

--
Yasuo Ohgaki
yohgaki@ohgaki.net

--089e0158b3742fe4e204eb295515--