Re: [PHP] Question about session_id() and session_start()

On 20-5-2013 22:14, Tim Schofield wrote:
> Matijn
>
> There are well over half a million lines of source code in PHP. It seems a
> little unhelpful to tell someone to go and read half a million lines of C
> when you could just tell them the answer?
>
> Thanks
> Tim
>
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> On May 20, 2013 6:24 PM, "Matijn Woudt" <[email protected]> wrote:
>
>> On Mon, May 20, 2013 at 5:33 AM, 孟远涛 <[email protected]> wrote:
>>
>>> I find the Note in PHP document.
>>> http://www.php.net/manual/en/function.session-id.php
>>>
>>> "Note: When using session cookies, specifying an id for session_id() will
>>> always send a new cookie when session_start() is called, regardless if
>> the
>>> current session id is identical to the one being set."
>>>
>>> I feel puzzled about this feature. Even if the current session id is
>>> identical to the one one being set, session_start will send a new
>> cookie. I
>>> want to know why session_start behave in this way.
>>>
>>> Forgive my poor English. Thanks in advance.
>>>
>>
>> You will find the answer in the PHP source code.
>> If you don't want this to happen, check if the current session id matches
>> with the value you want to set it to, and don't set if they match.
>>
>> - Matijn
>>
>

Tim,

first of all, please bottom-post on this list.
Secondly, a simple google search for "php c session_start" resulted in 
this: https://github.com/php/php-src/blob/master/ext/session/session.c#L1303

- Tul