Cyrus SASL Extension

 SASL is the Simple Authentication and Security Layer (as defined by RFC
 2222). It provides a system for adding plugable authenticating support to
 connection-based protocols. The SASL Extension for PHP makes the Cyrus
 SASL library functions available to PHP. It aims to provide a 1-to-1
 wrapper around the SASL library to provide the greatest amount of
 implementation flexibility. To that end, it is possible to build both a
 client-side and server-side SASL implementation entirely in PHP.