I misunderstood what "expected result" meant.  If things were working correctly, the array would contain all the variables, even from previous pages.  In reality, it contains only variables added to the session array in the current page.

Thank you for this bug report. To properly diagnose the problem, we
need a short but complete example script to be able to reproduce
this bug ourselves. 

A proper reproducing script starts with <?php and ends with ?>,
is max. 10-20 lines long and does not require any external 
resources such as databases, etc.

If possible, make the script source available online and provide
an URL to it here. Try to avoid embedding huge scripts into the report.

I get 404 Not Found for both URLs.
Also, set session.use_trans_sid On and try again.

Oops, sorry - I specified the wrong directory.

The correct locations for the files are:

http://www.shoemakervillage.org/cd/20.html

http://www.shoemakervillage.org/cd/20.php
http://www.shoemakervillage.org/cd/21.php

I also forgot to mention about the trans_sid setting - I tried it a while ago.  Unfortunately, it did nothing - my understanding was that the ID would be contained in the URL.  Even with it set to 1 and use_cookies set to zero, it must have still been using cookies because no URL identifier was included.

Also, I spent another few hours thinking there was still something obvious I overlooked, and set up PHP for the IIS server.

You can try that one out at http://www.shoemakervillage.org:81/php/20.html.  The source is the same as on the Apache server.  I get similarly unpredictable results - but interestingly I discovered that on both installations if I pressed "Back" after getting to 21.php, the print_r command on 20.php would print out all three values.  If I then tried to re-enter the "Surname" value into 20.php, the "Name" value would again disappear.

Hope this helps,

-Steve

Sorry, but your problem does not imply a bug in PHP itself.  For a
list of more appropriate places to ask for help using PHP, please
visit http://www.php.net/support.php as this bug system is not the
appropriate forum for asking support questions.  Due to the volume
of reports we can not explain in detail here why your report is not
a bug.  The support channels will be able to provide an explanation
for you.

Thank you for your interest in PHP.

There is no bug. You're just doing something wrong (and as we didn't get any SHORT example script -> bogus)

What the heck?  How short does an "example script" have to be?  The files I gave you were six lines total!  The least you could do is look at them.

If the support channels were going to provide an explanation for me, they would have 30 hours ago.

I've already started rewriting in ASP.  I don't see why I ever bothered to waste so much time writing this long description.

Good luck,

-Steve