RE: [PHP4BETA] Re: PHP4 Session Management

Thank you for your reply. I am pleased to hear of alternative implementations. Here is what I think. Establishing a persistent connection as you explain would load balance "sessions" rather than "requests". Moreover, what happens if the connection goes down-- the session is then lost because the server is gone. A centralized database would alleviate this by picking up the session from a different server servicing the dropped request. thanks!again michael -----Original Message----- From: Chris Chabot [mailto:chabotc@reviewboard.com] Sent: Monday, April 03, 2000 7:09 AM To: Michael Nino; php4beta@lists.php.net Subject: Re: [PHP4BETA] Re: PHP4 Session Management Session management will work perfectly using the disk method as long as you configure your hardware (or software based, such as LVS (www.linuxvirtualserver.org)) for persistent connections. This way a client will always hit the same box in the session, thus enabling consitent session management. This (persistent connection config) btw is also needed if you ever want to do https, or any other server persistent actions. In my experiance most hardware & software based load balancing tools are able to do persistent connections. in LVS it would mean adding '-p 1800' to the cluster creation line. (without quotes) Hope this was of some help -- Chris Chabot Michael Nino wrote: Here's a question along the same lines. What if you have several webservers-- all processing PHP documents AND hardware is load balancing between them, then what is the preferred way to manage sessions? Centralized MySQL database? m -----Original Message----- From: Brendan W. McAdams [ mailto:brendan@plexmedia.com <mailto:brendan@plexmedia.com> ] Sent: Saturday, April 01, 2000 3:04 PM To: Hector Lucero Cc: php4beta@lists.php.net; php3@lists.php.net Subject: [PHP4BETA] Re: PHP4 Session Management no problem; I'm CCing this to the list in case anyone else cares to learn from it. >When you create a session, is that variable available throughout all pages? The session variable is available to all pages that create a session and as long as your session cookie is valid - the cookie by default expires when you close your browser. You need to declare a start of session on each page (see my previous post for more on that). Variables themselves ONLY go from page to page if you specifically tell your session to save them (see session_register in my last post) -- if you took all your variables it would take alot of disk space and memory so PHP just takes what you tell it to. >If you are submitting with an anchor i.e. a link, is that session variable available to other pages? Yes, two ways to do this: 1) Set the page you are linking to to start a session and find out what your session_id is. 2) link with a ?PHPSESSID=$PHPSESSID which passes your session ID automatically. >Can you give me an example of how to create a session since I have failed so far. Again I reccomend Julie Meloni's HotWired Webmonkey tutorial at: http://hotwired.lycos.com/webmonkey/00/05/index2a.html?tw=programming <http://hotwired.lycos.com/webmonkey/00/05/index2a.html?tw=programming> But here's my quick take on it using your examples pasted, now fixed for PHP Sessions (and with some of my own coding style applied, please forgive me): test.php <? echo "<html><body>"; echo "<form method=post action=test1.php>"; echo "<table><tr>"; echo "<td>Userid: </td><td><input type=text name=userid></td>"; echo "<td colspan=2><input type=submit value=\"Submit\">"; echo "</tr></table>"; echo "</body></html>"; ?> test1.php <? session_start(); session_register("user"); $user = $userid; echo "<html><body>"; echo "<form method=pos action=test2.php>"; echo "<input type=submit value=\"Submit\">"; echo "</form>"; echo "</body></html>"; ?> test2.php <? session_start(); // here's your problem - you need to pull the session up again to have access to its variables. // at this point $user was pulled out of the session cache on the server if (!$user) { // something happened, and for some reason the variable didnt save. echo("Error! Variable not found?"); exit(); // go bye-bye! } else { echo "<html><body>"; echo "User: $user"; // $user was pulled from the session ,we hope echo "</body></html>"; } ?> hope this helps. -brendan ----- Brendan W. McAdams | email: brendan@plexmedia.com Programmer/Systems Administrator | office: (305)377-2880 Plexus InterActive | pager: (305)277-4879 http://www.plexmedia.com <http://www.plexmedia.com> | cell phone: (305)401-7313 "Always listen to the experts - they'll tell you what can't be done and why. Then do it." -Robert A. Heinlein ----- Original Message ----- From: "Hector Lucero" <hql@pacbell.net> To: <brendan@plexmedia.com> Sent: Saturday, April 01, 2000 4:18 PM Subject: PHP4 Session Management Hi,, Excuse me for sending you an email being a total stranger. I saw your response to one of the session emails in the php list. I am new to PHP and do not know how to create a session. Could you enlighten me a bit on the subject. I am using php4. * When you create a session, is that variable available throughout all pages? * If you are submitting with an anchor i.e. a link, is that session variable available to other pages? * Can you give me an example of how to create a session since I have failed so far. Note: This is what I have been doing and when I try to see the variable in other pages I dont get anything in test2.php. Am I doing something wrong? Thanks a million; Hector test.php <? echo "<html><body>"; echo "<form method=post action=test1.php>"; echo "<table><tr>"; echo "<td>Userid: </td><td><input type=text name=userid></td>"; echo "<td colspan=2><input type=submit value=\"Submit\">"; echo "</tr></table>"; echo "</body></html>"; ?> test1.php <? session_start(); session_register("user"); $user = $userid; echo "<html><body>"; echo "<form method=pos action=test2.php>"; echo "<input type=submit value=\"Submit\">"; echo "</form>"; echo "</body></html>"; ?> test2.php <? echo "<html><body>"; echo "User: $user"; echo "</body></html>"; ?> -- PHP 4.0 Beta Mailing List < http://www.php.net/version4/ <http://www.php.net/version4/> > To unsubscribe, e-mail: php4beta-unsubscribe@lists.php.net For additional commands, e-mail: php4beta-help@lists.php.net To contact the list administrators, e-mail: php4beta-admin@lists.php.net