session variables

[Anon]

if I want to pass a variable to a new page (index.html) using a link, I just do:

<a href="index.html?myvar=new_value">...

so I get $myvar in index.html with the value "new_value". OK.

But now, if $myvar is a registered session variable ( session_register("myvar") ),
it seems that I cannot change the value of $myvar as I did before:

<a href="index.html?myvar=new_value">...
doesn't change the value of $myvar (in index.html I get $myvar with the value "old_value").

It is the same with forms!

What is the solution?

[Anon]

Session variables always overrule POST and GET variables.
This is good, because session data might contain iformation about
who is loged on, and that access rights this person has.
If it was possible to fill session variables using post and get, sessions would be very unsafe to use.

If you want to enter the value into a registered variable, you'll have to do so in php. That means you'll have to pass the value to the next page using a different variable name (unless you do not have "register_globals" on I believe)
and you'll have to do something like
$my_session_variable=$my_post_or_get_variable.