session_regenerate_id
    (PHP 4 >= 4.3.2, PHP 5)
session_regenerate_id -- 
   Update the current session id with a newly generated one
  
Description
bool 
session_regenerate_id ( [bool delete_old_session] )
   session_regenerate_id() will replace the current
   session id with a new one, and keep the current session information.
  
Parameters
   
- delete_old_session
 
        Whether to delete the old associated session file or not. Defaults to
        FALSE.
       
 
  Return Values
   Returns TRUE on success or FALSE on failure.
  
Examples
   
Example 1. A session_regenerate_id() example 
<?php session_start();
  $old_sessionid = session_id();
  session_regenerate_id();
  $new_sessionid = session_id();
  echo "Old Session: $old_sessionid<br />"; echo "New Session: $new_sessionid<br />";
  print_r($_SESSION); ?>
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