[PHP] Re: synchronizing php functions
Well I have a system that people can login to, and I want to produce an array (or something of the sort) that holds who is logged in so that I can monitor it. The problem is that sessions are local to the clients machine so if I tried to put this information in the session then the only information that I would get back is the people that are logged in on my machine, not the server (Please tell me if I wrong in what I say here). Therefore I need to be able to but this information in the session and have it available to all sessions (sort of like the way static variables in Java belong to the class and not the individual objects that are created from that class). So if you undersatnd what I'm trying to do here and know of a way to do it I would love to here it. On Tue, 02 Jul 2002 18:45:40 -0500 [EMAIL PROTECTED] (Richard Lynch) wrote: Does anyone know anyway to synchronize calls to php functions. I was thinking of writting a hack that uses a lock file on the server put if there is a proper way to do it then I would rather use that. Any suggestions would be good. Shared memory may be faster than lock files... *WHY* you think you need synched PHP functions might be an interesting discussion, though if it's just for fun, have at it. -- Like Music? http://l-i-e.com/artists.htm |---| Philip MacIver |---| | -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Re: synchronizing php functions
On Wednesday, July 3, 2002, at 04:08 AM, Philip MacIver wrote: The problem is that sessions are local to the clients machine Huh? so if I tried to put this information in the session then the only information that I would get back is the people that are logged in on my machine, not the server (Please tell me if I wrong in what I say here). Therefore I need to be able to but this information in the session and have it available to all sessions (sort of like the way static variables in Java belong to the class and not the individual objects that are created from that class). So if you undersatnd what I'm trying to do here and know of a way to do it I would love to here it. This has been discussed on the list before, and even I think just last week (so check the archives, using server variables asp as your search criteria). Some theories suggest that it would entail a lot of overhead, unless you only have a few users to keep track of simultaneously. Possible suggestions are 1) if the data doesn't change, put it into an includefile 2) if the data is dynamic, be clever and implement this yourself with database-managed persistence (but beware the overhead). Erik Erik Price Web Developer Temp Media Lab, H.H. Brown [EMAIL PROTECTED] -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Re: synchronizing php functions
Well I have a system that people can login to, and I want to produce an
array (or something of the sort)
that holds who is logged in so that I can monitor it.
Aha!
The who's logged in right now feature! :-)
Problem #1.
First, you need to clearly define logged in
Am I logged in for the less than 2 (hopefully!) seconds that it takes me to
download a single HTTP page, or am I logged in until I log out or am I
logged in until I don't do nothing for N minutes, and then I'm
auto-logged-out, or some combination.
Because logged in has *NO* real meaning in an HTTP connection, unless you
want to strictly show who's using each HTTP connection at this 2-second
instance in time...
The problem is that
sessions are local to the clients machine
No, no, no.
PHP session data all lives on the server, except for the cookie ID on their
local machine, and you can even avoid the cookie ID if you want to use the
SID in every URL/ACTION/POST/GET HTTP connection.
so if I tried to put this information in the session then the only
information that I would get back is the people that
are
logged in on my machine, not the server (Please tell me if I wrong in what
I say here).
Either I'm not understanding what you want, or you're *WAY* off target...
If you want to know who is LOGGED IN to telnet/SSH on your WEB server, you'd
want to do like:
?php `who`; # Is it called 'who' ? Whatever Un*x command tells you who's
logged on.?
If you want the web-server to know who is LOGGED ON to your desktop, there's
no way PHP can do that. Big, big, big security issue on that one...
Now, maybe, if you had a Java applet and you authorized it to run and it
sucked in who was logged in to your desktop and sent that back to a Java
servelet, you could do that...
Dunno who would want that or why, nor who would trust the applet enough to
run it in the first place, but I think you *could* do that...
If you want to know who's surfing your web-site now, then you need to
better define what now means, and read the other parts of this post.
Therefore I need to be able to
but this
information in the session and have it available to all sessions (sort of
like the way static variables in Java belong
to the class and
not the individual objects that are created from that class). So if you
undersatnd what I'm trying to do here and know
of a way
to do it I would love to here it.
Easiest way to do this:
First, alter your user login/management table so that there is an 'activity'
datetime field.
Next, include something like this file on every page:
?php
$query = update users set activity = now() where user_id = $user_id;
mysql_query($query) or error_log(mysql_error());
?
To see who's logged on, just do:
?php
$query = select username from users where activity + 5*60 = now();
$current = mysql_query($query) or error_log(mysql_error());
while (list($username) = mysql_fetch_row($current)){
echo $usernameBR\n;
}
?
5*60 is 5 minutes. (60 seconds per minute) Change that to whatever you
like.
--
Like Music? http://l-i-e.com/artists.htm
--
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[PHP] Re: synchronizing php functions
Does anyone know anyway to synchronize calls to php functions. I was thinking of writting a hack that uses a lock file on the server put if there is a proper way to do it then I would rather use that. Any suggestions would be good. Shared memory may be faster than lock files... *WHY* you think you need synched PHP functions might be an interesting discussion, though if it's just for fun, have at it. -- Like Music? http://l-i-e.com/artists.htm -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
