Custom Session Handler

gistfile1.php

<?php

class SessionSaveHandler
{
  public function __construct()
  {
    session_set_save_handler(
      array($this, 'open'),
      array($this, 'close'),
      array($this, 'read'),
      array($this, 'write'),
      array($this, 'destroy'),
      array($this, 'gc')
    );

    register_shutdown_function('session_write_close');
  }

  public function open($savePath, $sessionName)
  {
    return true;
  }

  public function close()
  {
    return true;
  }

  public function read($id)
  {
    global $memcachedConnection;

    return 'data';
  }

  public function write($id, $data)
  {
    global $memcachedConnection;

    // save data

    // return true; // This is the important point. If you uncomment this line, everything works fine
  }

  public function destroy($id)
  {
    global $memcachedConnection;

    // destroy the session

    return true;
  }

  public function gc($maxlifetime)
  {
    return true;
  }
}

// Initialize the session save handler
$sessionHandler = new SessionSaveHandler();

// Start the session
session_start();

// Set the user-id
$_SESSION['user-id'] = 1;

// Display something
echo 'user-id stored';