How to force cookies, disable php sessid in URL ?

This commands disables php from rewriting URLs to add a phpsessid, and forces the use of cookie sessions instead. Using cookies is largely thought of as the preferred way to use sessions - both more secure and better for SEO. This can be accomplished by setting the appropriate values in php.ini, or at runtime. This snippet shows a runtime example:

<?php
//These commands must be set BEFORE the session is started
ini_set('session.use_trans_sid', false);
ini_set('session.use_only_cookies', true);
ini_set('url_rewriter.tags', '');

//start session...