Session & Forms

[Anon]

I use the following function to register my form variables in my session. However after my data sumbission, I need empty forms - instead I see the variables from my session variable. How do I get rid of these variable values from my session. I tried session_unset and session_unregister without luck. Again, I need to reset only certain values in the session file (eg. I do not want to reset userId). Can some one please help. Thanks in advance.

function grabvar($varname)
{
global $$varname, $HTTP_GET_VARS, $HTTP_POST_VARS;

session_register($varname);
if (isset($HTTP_POST_VARS[$varname])) {
$$varname = $HTTP_POST_VARS[$varname];
}
if (isset($HTTP_GET_VARS[$varname])) {
$$varname = $HTTP_GET_VARS[$varname];
}
}

[Anon]

Either set your variables = "" or use the unset command on each of the variables. The Session handler in PHP is creating and passing your variables into each of your scripts that you request them, using session_unset just tells the Session Handler not to capture that variable anymore, but it's already created the local variable for your use in the script.

The final solution is to not put the variable name as the value to your form. However doing this will have the effect of always showing your form as empty and not prefilling any of the fields for your user.

[Anon]

function ungrabVar($varname)
{
global $$varname, $HTTP_GET_VARS, $HTTP_POST_VARS;
//session_unregister($varname);
//$GLOBALS[$varname] = "";
//$HTTP_SESSION_VARS[$varname]="";
if (isset($HTTP_POST_VARS[$varname])) {
$HTTP_POST_VARS[$varname] = "";
$$varname = $HTTP_POST_VARS[$varname];
}
if (isset($HTTP_GET_VARS[$varname])) {
$HTTP_GET_VARS[$varname] = "";
$$varname = $HTTP_GET_VARS[$varname];
}

} 

function rereg(&$variable, $string) {
session_register($string);
if (isset($HTTP_POST_VARS[$string])) { $variable = $HTTP_POST_VARS[$string]; $$variable="";}
}

I've tried both of the above functions, to unset the variables. Doesn't work.
ungrabVar('MyVar');
rereg(YourVar, "");
Is there something I am missing. My register_globals and track_vars in php.ini is turned on.

[Anon]

oops...should read
rereg($var, 'var');