Some potential libs
https://packagist.org/?q=openfire%20&p=0
https://packagist.org/packages/abhinavsingh/jaxl
https://packagist.org/packages/gidkom/php-openfire-restapi
All XMPP libs on Packagist
http://www.ibm.com/developerworks/xml/tutorials/x-realtimeXMPPtut/