PHP/Cookie Session/Session Variables Unregister

Unregistering Variables

<?php
  session_register ("A") ;
  if (session_is_registered ("A" ) ) {
     session_unregister ( "A" ) or die ( "Could not unregister the session variable " ) ;
  }
  if (session_is_registered ("A" ) ) {
     echo "This session is still registered. " ;
  } else {
     echo "The session has been successfully unregistered! " ;
  }
?>