[PHP] manually unserializing session data

[Andrew Warner]

How do you manually unserialize session data? Using unserialize() on 
session data from a sessions table is not working for me.

I have modified the gc function of my MySQL session handler to save 
data  from expired session records to another table, 
'sessions_saved'.   I can get the session data out and into the 
sessions_saved table okay, but i can't restore some of the saved 
session variables i need for field values in the sessions_saved table.

In the code below, $sess_data['pid'] is always empty even though I 
can see it and its value in the serialized session data.  The $pid 
value has already been set to a session value using: 
session_start(); $_SESSION['pid'] = $pid



function mysql_sess_gc ($sess_maxlife)
{
  (code here to query session table for expired sessions)

// loop thru expired sessions and save to 'sessions_saved' table:
while (list($sess_id,$data) = mysql_fetch_array($r))
{
   $sess_data = unserialize($data);
   $pid = $sess_data['pid'];
   $sid = $sess_data['sid'];
   //store sessions in saved_sessions table
   $query =  "INSERT INTO sessions_saved (id,pid,sid,data) VALUES 
('$sess_id',$pid,$sid,$data)";

   $result = mysql_query ($query, $mysql_sess_conn_id);
}
  (...now delete expired sessions from sessions table)

}

andrew

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