Hi,

a strange problem, with session and register_global.
The problem does not exist with PHP-4.2.3.

When you have a variable set to a undefined value of
$_SERVER array, and register_global set to ON, PHP set
all variables to the same value (the last value).
If you reload the page, there is no problem, it is only
the FIRST time you read the page where there is the
session variable is built.
If you try with an unset variable, there is no problem.

By the way, I don't understand the last message about
"Your script possibly relies on a session side-effect..."
when register_global is set to OFF.


Best Regards,

Nicolas



--- info PHP

 PHP Version 4.3.0
 register_argc_argv On
 session.auto_start  Off
 session.bug_compat_42  On
 session.bug_compat_warn  On
 session.cookie_domain  no value
 session.name  PHPSESSID
 session.use_cookies  On
 session.use_only_cookies  Off
 session.use_trans_sid  Off

-------------- test.php -------------
+++SCRIPT+++
session_start();
$referer=$_SERVER['HTTP_REFERER']; # ERR (first time)
#$referer="----"; # OK (always)
session_register("referer");

echo "<PRE>"; echo session_encode(); echo "</PRE>";

$var1="V1";
$var2="V2";
$var3="V3";
echo "<BR>$var1 -- $var2 -- $var3 -- $var_not_affected\n";
+++

------- WITH register_global : On
At the first execution of ths script:

+++OUTPUT+++
referer|N;


V3 -- V3 -- V3 -- V3
+++

AND after reload:

+++OUTPUT+++
referer|N;


V1 -- V2 -- V3 --
+++

------- WITH register_global : Off

+++OUTPUT+++
referer|N;


V1 -- V2 -- V3 --

Warning: Unknown(): Your script possibly relies on a
session side-effect which existed until PHP 4.2.3.
Please be advised that the session extension does
not consider global variables as a
source of data, unless register_globals is enabled.
You can disable this functionality and this warning
by setting session.bug_compat_42 or
session.bug_compat_warn to off, respectively. in
Unknown on line 0
+++