User status Online/Offline?

I want to know how to check that user is online or offline by Php.If
he visit pages then he is online, if he not accessed page he is
offline. How to handle this is in PHP...I set session of each user...

..oO(Php Developer)

>I want to know how to check that user is online or offline by Php.If
>he visit pages then he is online, if he not accessed page he is
>offline.

He's "online" while the script is running, after that he's "offline"
until the next request. That's simply how HTTP works.

Micha

Php Developer schrieb:
> I want to know how to check that user is online or offline by Php.If
> he visit pages then he is online, if he not accessed page he is
> offline. How to handle this is in PHP...I set session of each user...
That is *not* possible.
PHP genarates the code, sends it to the Client and FINISH.
So you have to do something on the website.
Maybe an AJAX request every x Seconds.
But when the client has no JS, or disabled it....
.... it doesn´t work too.
And when JS is working an the person at the computer is sleeping?


Result:
Forget it.


Olaf

Facebook shows who's online by identifying which members have been
active in the last five minutes.

how? I'm not sure? maybe some kind of authentication and reading the
apache access log? maybe some kind of database table?

..oO(macca)

>Facebook shows who's online by identifying which members have been
>active in the last five minutes.
>
>how? I'm not sure? maybe some kind of authentication and reading the
>apache access log? maybe some kind of database table?

You just have to keep track of active sessions. One way to do this in
PHP is to use your own session handler, which stores the session data
and a timestamp in a DB table (or just the timestamp in the DB and the
session data in flat files, whatever you like). Then you just have to
fetch all records that were updated in the past 5 minutes or something
like that.

But even this is just a wild guess and never really accurate. As said,
HTTP doesn't allow for accuracy here:

* user sends request
* user gets answer
* user is gone

It's always the same.

Micha

On Wed, 19 Dec 2007 19:23:31 +0100, Michael Fesser <netizen@gmx.de>
wrote:

>.oO(macca)
>
>>Facebook shows who's online by identifying which members have been
>>active in the last five minutes.
>>
>>how? I'm not sure? maybe some kind of authentication and reading the
>>apache access log? maybe some kind of database table?
>
>You just have to keep track of active sessions. One way to do this in
>PHP is to use your own session handler, which stores the session data
>and a timestamp in a DB table (or just the timestamp in the DB and the
>session data in flat files, whatever you like). Then you just have to
>fetch all records that were updated in the past 5 minutes or something
>like that.
>
>But even this is just a wild guess and never really accurate. As said,
>HTTP doesn't allow for accuracy here:
>
>* user sends request
>* user gets answer
>* user is gone
>
>It's always the same.
>
>Micha

There are ways of doing it with Java or Flash 9...on the same level of
accuracy you would get with an IRC channel...but that still includes
people who visit a site, leave it on and then go to the grocery store
or whatever.

--

Onideus Mad Hatter
mhm ¹ x ¹
http://www.backwater-productions.net
http://www.backwater-productions.net/hatter-blog


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-------------
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they're just born with a soul. *snicker*...yeah, like they're just
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So the Hare took a long stare and decided at best, to leave the rest,
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..oO(Onideus Mad Hatter)

>On Wed, 19 Dec 2007 19:23:31 +0100, Michael Fesser <netizen@gmx.de>
>wrote:
>>
>>But even this is just a wild guess and never really accurate. As said,
>>HTTP doesn't allow for accuracy here:
>>
>>* user sends request
>>* user gets answer
>>* user is gone
>>
>>It's always the same.
>>
>>Micha
>
>There are ways of doing it with Java or Flash 9...on the same level of
>accuracy you would get with an IRC channel...but that still includes
>people who visit a site, leave it on and then go to the grocery store
>or whatever.

So after all you gain nothing more from it than with plain HTML or maybe
some JavaScript.

Micha