Xmpphp is the successor to class.jabber.php. taking advantage of php5, it is an elegant solution with a direct approach.

some of the features include:
* connect to any xmpp 1.0 server (google talk, lj talk, jabber.org, etc)
* supports tls encryption
* several xml processing approaches and supported styles (process
indefinitely, processuntil an event, processtime for a number of seconds),
waiting on events or map them, etc.
* persistent connections