<?php
class Foo {
function open() {}
function close() {}
function read() {}
function write() {}
function destroy() {}
function gc() {}
}
$session_handler = new Foo;
session_set_save_handler( array($session_handler, 'open'), array($session_handler, 'close'), array($session_handler, 'read'), array($session_handler, 'write'), array($session_handler, 'destroy'), array($session_handler, 'gc'));