title: When setting a session with PHP, how do you make it global to the entire site?
body: <p>I am creating a session and I want a variable to be available for the entire site, so for example:</p>
  
  <p>Joe Soap lands on a page called <em>red-widgets.php</em>, - Joe's session variable is let's say 'red-widgets'. Joe then clicks on another page called <em>blue-widgets.php</em>. I would like the session variable to be still the original 'red-widgets'.</p>
  
  <p>How can this be done with the url?</p>