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Posted by Erwin Moller on 10/26/06 08:49
Steve Wright wrote:
> Forgive my ignorance, but I am just starting to learn about sessions in
> PHP and how to pass data from one page to the next. What I'm about to
> explain could just be my misunderstanding of how sessions work.
>
> I have two test scripts. The first starts a session, displays a few
> details and a form. When the form is submitted it jumps to the second
> page. The first script looks like this.
>
> <?php
> session_start();
> ?>
> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
> "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
> <html xmlns="http://www.w3.org/1999/xhtml">
> <head>
> <title>Session test : Page 1</title>
> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"
> />
> </head>
> <body>
> <ul>
> <?php
> $_SESSION['session_var'] = "testing";
> echo "<li>Your session id is ".session_id()."</li>\n";
> echo "<li>The SESSION array contains<br />\n";
> print_r($_SESSION);
> echo "</li>\n";
> echo "<li>The SID is ".SID."</li>\n";
> echo "<li>PHPSESSID = ".$PHPSESSID."</li>\n";
> ?>
> </ul>
> This is the test of the sessions feature
> <form action="session2.php" method="post">
> <input type="hidden" name="form_var" value="testing" />
> <input type="submit" value="Go to next page" />
> </form>
> </body>
> </html>
>
> The second script displays the same variables as the first. In addition
> it dislpays the value of a variable passed by the _$SESSION array and a
> value passed via a form. It looks like this.
>
> <?php
> session_start();
> ?>
> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
> "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
> <html xmlns="http://www.w3.org/1999/xhtml">
> <head>
> <title>Session test : Page 2</title>
> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"
> />
> </head>
> <body>
> <ul>
> <?php
> echo "<li>Your session id is ".session_id()."</li>\n";
> echo "<li>The SESSION array contains<br />\n";
> print_r($_SESSION);
> echo "</li>\n";
> echo "<li>The SID is ".SID."</li>\n";
> echo "<li>PHPSESSID = ".$PHPSESSID."</li>\n";
> echo "<li>session_var = {".$_SESSION['session_var']."}</li>\n";
> echo "<li>form_var = {".$_POST['form_var']."}</li>\n";
> ?>
> </ul>
> </body>
> </html>
>
> When run under IE6, I get the following output.
>
> Script 1
>
> · Your session id is d7e201df8eb6ac9fd76915e53051666d
> · The SESSION array contains
> Array ( [session_var] => testing )
> · The SID is PHPSESSID=d7e201df8eb6ac9fd76915e53051666d
> · PHPSESSID =
>
> Script 2
>
> · Your session id is 40211048ab6869c74dc8e9dff6098dc0
> · The SESSION array contains
> Array ( )
> · The SID is PHPSESSID=40211048ab6869c74dc8e9dff6098dc0
> · PHPSESSID =
> · session_var = {}
> · form_var = {testing}
>
> Note how the session id is different and the variable passed by the
> _$SESSION array is blank.
>
> When run under Firefox 2.0 I get the following;
>
> · Your session id is 00802b0742fdb87cda553cba85027c30
> · The SESSION array contains
> Array ( [session_var] => testing )
> · The SID is PHPSESSID=00802b0742fdb87cda553cba85027c30
> · PHPSESSID =
>
> and
>
> · Your session id is 00802b0742fdb87cda553cba85027c30
> · The SESSION array contains
> Array ( [session_var] => testing )
> · The SID is
> · PHPSESSID =
> · session_var = {testing}
> · form_var = {testing}
>
> This time, the session ids are the same and the variable is passed.
>
> Any ideas why the difference?
> With Firefox, why is SID populated on the first page and not the
> second?
> Why is PHPSESSID blank?
>
> In case it helps, the values from the php.ini file for session are;
>
> session.auto_start = 0
> session.cache_expire = 180
> session.cache_limiter = nocache
> session.cookie_domain =
> session.cookie_lifetime = 0
> session.cookie_path = /
> session.entropy_file =
> session.entropy_length = 0
> session.gc_maxlifetime = 1440
> session.gc_probability = 1
> session.name = PHPSESSID
> session.referer_check =
> session.save_handler = files
> session.save_path = /tmp
> session.serialize_handler = php
> session.use_cookies = 1
> session.use_trans_sid = 1
>
> Regards
> Steve Wright
Hi Steve,
This is strange indeed.
Did you by any chance disable cookies on IE?
Also look for a ini value named:
session.use_only_cookies
(That one is added in version 4.3)
Or are you maybe using an older version of PHP?
(If so, please upgrade.)
Regards,
Erwin Moller
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