Global Variables Across Classes

[ziycon]

I'm trying to use a global variable across multiple classes, for example one class has:

Code Select Expand

global $logged_in;

if($logged_in)
  //your logged in
else
  //your not logged in

Then in the login class I have the below code:

Code Select Expand

global $logged_in;

if(//details are valid)
  $logged_in = true;
else
  $logged_in = false;

False always works but the 'true' value isn't being picked up even when set yo true!?

Any help greatly appreciated.