title: Looping Through All a Server's Sessions in PHP
body: <p>Is there a way in PHP to get a list of all sessions (and the variables within each) on the server?</p>
  
  <p>Basically, we have a maintenance function which needs to know which users are currently logged into the site.  We already store data for each user in a session variable, but I am hoping that I can loop through each of these sessions and pluck out the data I need.</p>
  
  <p>MY PHP is very limited (I am a .Net developer ussually) but if anyone knows if this is even possible (and how to do it) I'd be very grateful.  I googled this, and the results I found tended to inidcate that it WASN'T possible, but I find this very hard to accept.</p>
  
  <p>Still, If you can't you can't but I thought my buddies on StackOverflow could give me a definitive answer!</p>