[PHP] Help with session

[Karl J. Stubsjoen]

I have 2 functions on my page, RegisterUser, IsValidUser.
RegisterUser looks in the querystring to see if you've passed a certain key
& value.   If you have it populates a session variable called "ValidUser"
with a 1.
All that IsValidUser does, is check to see if the session variable
"ValidUser" is a 1 or not.

It doesn't work.
RegisterUser (which sets session variables) is taking place before headers
are written to the browser.  I'm not gettin errors, but the problem is that
ValidUser isn't able to read the session variable for some reason.

Any Ideas?

Here is the code for these 2 functions:

function IsValidUser()
{
global $HTTP_SESSION_VARS;

$reslt = 0;

  if (isset($HTTP_SESSION_VARS["ValidUser"]))
   {
    if ($HTTP_SESSION_VARS["ValidUser"] == "1")
     $reslt = 1;
  }
  print("ValidUser? " . $HTTP_SESSION_VARS["ValidUser"] . "<br>");

return($reslt);
}


function RegisterUser()
{
global $HTTP_SESSION_VARS;
global $HTTP_GET_VARS;
$reslt = 0;

if (isset($HTTP_SESSION_VARS["ValidUser"]))
{
 if ($HTTP_SESSION_VARS["ValidUser"] == 1)
 {
   $reslt = 1;
 }
}

if ($reslt=0);
{

 $Val_User = $HTTP_GET_VARS["fis"];

 if ($Val_User == "1")
 {
  $reslt = 1;
     if (!isset($HTTP_SESSION_VARS["ValidUser"]))
     {
    session_start();
     session_register("ValidUser");
     $HTTP_SESSION_VARS["ValidUser"] = 1;
    }
    else
    {
     $HTTP_SESSION_VARS["ValidUser"] = 1;
    }
 }
 else
 {
 $reslt = 0;
 }
}
return($reslt);
}



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