title: Do AJAX requests retain PHP Session info?
body: <p>If I had a user logged onto my site, having his id stored in <code>$_SESSION</code>, and from his browser he clicked a 'Save' button which would make an AJAX request to the server. Will his <code>$_SESSION</code> and cookies be retained in this request, and can I safely rely on the id being present in the <code>$_SESSION</code>?</p>